I haven't even used magic at all yet..what's the recommended build for a Mage?

head, torso, legs and some hands to cast spells.

Not sure on ideal but the build i play with which i have a lot of fun with is a mix of schools.

Probably use:

Conjuration: 70 %

Destruction: 20%

Illusion: 10%

Use this with one handed, archery, sneak and also dabble in alchmy and enchanting.

Jack of all trades...master of none? You decide....

7 hands minimum.

At least, you might have some more powerfull effects then.

Creds for him.

conjuration, destruction, restoration and/or alteration

all you need.

Alchemy offers lots of buffs for mages. Restore magicka can be a must for repeated destruction casting, fortify destruction can give a nice damage bonus, and fortify health might just stop your unarmoured mage dying from one hit, and those are just the obvious ones.

I use shrouded robes/light armor/mage robes, the +100% mana regen mask, and destruction spell fireball (lvl 42 destruction), glauder amulet and enchanted gear. I also use fast healing and some conjuration magic for miscellaneous uses