Mana: sleep or potions, no other way and food isn't practicable, a mage does not eat much = the best are restoration potions, did you notice the alchemy thread I added in the post above?

I'll tell you how I did it, ok?
Per lvl-up: 2 pts in int. the rest on the others = had far over 100
agility? depends on the weapon = for bows pretty high
armour depends on strength 60-70 at least

Look for items/weapons/armour boosting up stats and giving spells, you'll find them <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />.
Kiya

Learn the enchant weapon skill = you can boost up stats via charms, do you know how? Enchanting weapons, warrior skill, click here
There are no class restrictions, just change your path in the abilities book, by clicking on the < > buttons, then choose the skill you wish and confirm.