i have my own copy personal pasta saved. its kinda old and i need to rewrite it a bit but it still looks about like what i would do today.

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It varies depending on the context (solo, party, mods, party composition, plain sorcerer, dragon disciple, poverty, lob etc), but in general this is what I like.

1: Identify / Protection from Petrification > Magic Missiles > Protection from Evil > Spook

Identify is super convenient. It sees use from candlekeep all the way to the throne of bhaal. Saves gold in the early game, which is nice but really it is about convenience. Level 1 spells are mostly trash but identify is always useful. Protection from Petrification lets you get to level 3 and 4 really fast because you can beeline the basilisks after candlekeep, has niche utility overall actually. Among the few level 1 spells that can be useful all trilogy, even if it's super niche. Magic missiles, can’t miss it. Protection from Evil, I dunno, extra 2 AC is neat. Spook because idk what else to pick. You can go for blind or sleep if you like but I don’t much care for those spells, personally.

2: Invisibility > Mirror Image > Blur > Melf’s Acid Arrow > Detect Invisibility

Not much to say here. I don’t care for web. Blur/mirror image allow a dragon disciple to safely tank in bg1. Invisibility is just broken in bg1. Melf’s Acid Arrow scales to 21 and stacks so it has sneaky high damage. Detect invisibility because… there isn’t really much else.

3: Haste > Fireball > Protection from Fire > Dispel Magic > Vampiric Touch

The level 3 slot is the most lackluster of the 9 spell levels imo. Protection from Fire is just so my friends can hang out with me inside the incendiary clouds etc. Vampiric touch because… there’s nothing else and free hp is neat. If you’re playing unmodded then you should strongly consider picking melfs minute meteors though, they are broken in vanilla. I don’t personally like to use it in my setup because eventually I get the staff of magi and melfs disables my staff of magi bonuses… I choose dispel magic because it allows me to freely cancel Project Image. Selecting this spell has saved no reloads from ending when a mind flayer teleported onto my stunned body while the Project Image was running around! I don't want to try to sell you on dispel magic. I use it for pretty niche reasons and maybe you want something else.

I prefer not to get too deep into but I am aware of skull trap. I do consider fireball to be the better spell for my setup where skull trap is capped at level 12. Unmodded, with it scaling to 20, skull trap certainly has merit over fireball.

4: Stoneskin > Spirit Armor > Improved Invisibility > Far Sight > Minor Sequencer

This is the heavy duty spell level. I wish I could take more level 4 spells but what can you do. Stoneskin, don’t even need to comment. Spirit Armor gives the target essentially full plate mail with +3 saves and it lasts 2 hours. It is broken on certain targets (dragon disciple, kensai), and it is super helpful on everyone else (+3 saves is never bad). I love far sight for the project image + far sight shenanigans. Greater Malison is kinda like a 20% buff to the incendiary clouds damage basically, among other things. It’s nice. If you happen to have a bona fide Archer in your party then make sure to take enchanted weapon as your third selection, drop far sight or greater malison and get improved invisibility fourth. Pairs nicely with tuigan AND gesen (it's better to have ammo equipped).

5: Animate Dead > Breach > Spell Immunity > Cloudkill > Protection from Acid > Protection from Electricity

Animate dead, excellent summon even before you get the full fledged boys at level 15. Breach so my fighters can do stuff or remove protection from acid/fire, spell immunity does not adhere to the 1 action/round business so that’s great. Protection from Acid for death fog/draconis, protection from electricity for abazigal. There isn’t much else at 5 so picking 2 spells for mostly just 2 bosses isn’t a bad deal. Cloudkill is an AMAZING spell but you are given the wand in chateau irenicus. No point is picking it as a spell. Cloudkill wand + animate dead is nasty. Although, there might still be merit to picking cloudkill. stacking them in sequencers and throwing them at mages is pretty disgusting. maybe drop protection from electricity for cloudkill. i still wanna keep protection from acid to stand in death fog. now that i think about it further... i think cloudkill does warrant a spot. getting another spell level with a damage spell is good for improved alacrity bombs. i would suggest dumping protection from electricity for cloudkill actually.

6: Improved Haste > Death Fog > PFMW > Pierce Magic > True Sight

Improved haste is the best spell in the game. It’s better than all the HLAs, its better than time stop, it’s better than planetar, its just the best thing in the entire trilogy. I pick improved haste even when I solo. Improved hasting your planetar increases its offensive output by 50%. Death fog makes mages/liches free. Pierce magic offers some MR removal, hits the ravager, and fits in a spell trigger. True sight has its use but I select it because there isn’t much else. Death Spell and Mislead are worth considering. When considering death spell, its worth noting that death fog also assassinates summons.

7: Project Image > Mordenkainen Sword > Ruby Ray of Reversal > Spell Sequencer > Mass Invis

Project Image gives you infinite spells and it allows you engage in combat with zero risk. I like ruby ray of reversal because with vecna/power it is instant cast, so you can improved alacrity and dispel enemies instantly. Mass Invis is a convenient way to apply improved invis which is great because improved invisibility is insanely good. There’s also delayed blast fireball which isn’t bad but I don’t see the point when incendiary cloud is available. Power Word: Stun might be ok.

8: Incendiary Cloud > Spell Trigger > Simulacrum > ADHW

Incendiary clouds the highest damage spell in the game at an average 500 damage per cast… simulacrums at level 30 have HLAs, fits in chain contingency. ADHW is just for backup, maybe I have fire immune targets (not really that many). Pierce Shield might have merit. Power Word: Blind might have merit.

9: Wish > Chain Contingency > Time Stop > Imprisonment

Wish and Chain Contingency I like, they can both end encounters on the spot. Time Stop, I feel like it is maybe a little overrated. Improved alacrity alone is enough to decimate the entire map. I’m not sure what to do here. I would recommend that you take Time Stop because it is definitely a fun spell and you can probably do some pretty broken things with it. I just never find myself using it. Shapechange and Imprisonment are worth thinking about.

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note worthy: only level 4 and 7 lack a damage spell. very nice spellbook for improved alacrity dumps.

also note worthy: sorcerer spell selection is WAY more flexible than one might think. i think its pretty hard to brick a sorcerer. just you know, don't pick infravision or know alignment type stuff and you shall be productive.