1) Alchemy - I love making potions in Oblivion 2) Smithing - I waited for this since Oblivion 3) Enchanting - If you noticed, I like making items by myself 4)Destruction - I'm a Mage. Mages need this skill.
First character: one handed, sneak, illusion, smithing/light armor Second character: one handed, sneak, lockpicking, enchanting Third character: destruction, alteration, conjuration, restoration