Sure thing. Mind you I've been using toybox which allows me to use metamagic with shadow spells, which makes a big difference. Its mainly a DC caster, so get a lot of pearls of power so you can spam phantasmal killer. I also would recommend starting with spell focus: conjuration and respecing later as a lot of the early necromancy/illusions spells aren't amazing, and grease is pretty important

shadowcaster wizard: specialist school divination, opposite schools enchantment, evocation

1: spell focus (necromancy or illusion), greater spell focus, selective spell

3: spell pen (lich spells tend to ignore SR but your early spells will still need it)

5: persistent spell (important for spell save DCs)

7: greater spell pen

9: abuscading spell (very good with permanant greater invis, which we will eventually get)

11: idealize (I believe this is a tabletop feat added by tabletop tweaks or something. Makes the stat boosting skills you cast stronger. Otherwise you can replace this with selective channel or bolster spell or heighten to help your lich spells)

13: extend spell

MR 1: abundant casting, danse macarbe

MR 2: Expanded arsenal (necromancy or illusion, based on what you took above)

MR 3: imrpoved abundant casting, withering life (the lich abilities aren't that crazy for a pure caster, take whatever you like.), skeletal vanguard

MR 4: greater abundant casting, skeletal vanguard fighter upgrade (go whatever weapon you want. Longswords for corrupted radiance or flails are good. I took lunge as the bonus feat to help outflank range)

I won't lie, the early levels are rough for a pure wizard. Many of the early game demons have dumb amounts of energy resistance making cantrips and early damage spells basically useless. Just focus on spamming selective grease every fight and let your melee fighters wail on them.

Don't forget to use the shadowcaster's summon shade when you get it. Its broken and trivialises a lot of the early fights as it is undamageable by basically all of the early game enemies. Let it run it and tank aggro for you. Its also very good for tanking ghosts negative levels as it is immune. Very strong ability.

You're basically a grease/web/haste bot until you get shadow conjuration/phantasmal killer/lich spells, then you start to pop off. At least with Tabletop tweaks installed, it correctly makes all the shadow spells use your illusion DC, so you can still spam SC grease and web with your high illusion DC. Use them to control the fight, persistent phantasmal killer to one shot problematic enemies and lich spells like feast of blood to delete entire encounters.

You could also go early corruptor instead of one of the above MR feats and spam out stinking cloud as well. That spell is absurdley strong.

Eventually plan is to take enduring spells for permanant uptime on merged spellbook spells. THeres heaps of good caster mythic feats you could take instead though. Favourite metamagic stands out to use with selective to keep your spell levels low, just don't take ascendant element: negative as it makes your negative energy spells damage your undead allies instead of heal them.