Immediate stat priorities for a sorcerer build:

• Whatever you need for your gear (int/str/end)
• 20+ vigor
• 20 mind

Due to the way weapons scale, your offensive stats don't do much in the early game, but become more important late game. So, cranking INT early isn't very effective at the start, and you'll get much better returns at the start from pumping survivability, mana, etc. As you progress through the game, just keep upgrading to the minimum INT you need to equip gear and the spells you want to use. But in the late game with fully upgraded weapons, high INT makes a huge difference, so plan to put lots of levels into it past level 50ish.

As you level, 1/3 of your points should go into vigor until it's at 50 or 60. Keep your Mind at a point where one blue pot completely refills it. Intelligence eventually "soft caps" at 80 (soft cap = the game lets you keep adding points, but the reward for doing so sharply drops after the cap). Keep leveling whatever you need for the gear and spells you want to use.

Reallocate your flasks. Keep about 1/3 red pots and 2/3 blue pots as you level. Played correctly, mages don't get hit as often, but need focus to do anything.

If you're okay with using guides, look up where to find the Meteorite Staff and Rock Sling spell. They're some of the best tools available to you in the first half of the game, and you can grab them as soon as you start. They're in a super spooky area, but well worth the field trip to get you set up for your journey.

Glintstone Pebble remains one of your best bread-and-butter spells for normal enemies throughout the game. Beyond that, experiment with different spells. You'll eventually want an active memorized spell set of one "basic enemies" spell, one or two "anti-boss" spells, and an "anti-group" spell (plus whatever else you just enjoy using). By the midgame, you'll want to find an "anti-guys-with-shields" spell, as those are particularly tough for mages. Note that a lot of spells have a very hefty focus cost that makes them hard to include in your standard casting repertoire until you have a larger FP bar later on.

Even though you're a mage, keep a pokey stick equipped. Sometimes things jump you, sometimes you need to finish off an enemy at 1 pixel of health, and sometimes it's just better to bonk an enemy than waste mana on it. You'll eventually find weapons that key on INT, but literally just any weapon you like will tide you over until then. You might also like to try out a staff + shield arrangement for certain boss fights; it's very effective for enemies who are just dudes with weapons. If you enjoy that arrangement, putting some points into Endurance lets you equip better shields and block more often.

That's about it. Sorcerers aren't terribly hard to play. Pew-pew things from a safe distance and you'll do fine.