NOTE: Ok from here I will explan grinding out the rest of your magic skills but you dont have to do this. You should be around lvl 15-20 so its up to you.
Its also good if you go to Solsthiem and get the Black Book: The Sallow Regent in White Ridge Barrow for the Seeker of Sorcery perk before you enchant your gear and start
really grinding other skills. Its best to grind out Conjuration first before any other skill. Get it 100. Then buy master spell summon Dremora. Then go get the black book.
Allow your 2 Dremora to do the work for you killing the dragon priest in White Ridge Barrow.
Conjuring- buy horse cast soul trap until 100 (waiting 1 hour after your magika is out)
Illusion - Cast Muffel until 100
Alteration - Cast candlelight, Oakflesh, or telekinesis until 100 (your choice) Grinding this sucks but worth it.
Restoration - Cast equilibrium (dawnguard DLC) along with a healing spell. should allow you to cast nonstop if you keep your health up.
Destruction - I havent found a good way to spam destruction that works. The best thing you can do is be trained by Faralda at the College of Winterhold.
You should be Lvl 54 when you have All Magic skills, enchanting, and alchemy at 100. Here are the perks i took NOT in order of how i took them. Focus on Alchemy and echanting
perks first. Then do Conjuration. Make Sure you also do all the Master quests at the College of winter hold to unlock master spells. They are only availabe once you have 100 skill