So, I just bought the game, and I'm kind of at a loss here. I definitely want to use magic, and I'm chosing between Altmer or Breton. But, should I make it a pure mage, or is a battlemage worth it?

I want to pick at least conjuration and destruction. Enchanting seems useful too, but what else?

What concerns me about going pure mage is the defenses. How are they? Should I pick alteration or restoration to help with it if I decide to go that way?

And what about the battlemage? Does heavy armor hinder spellcasting in any way? Or should I skip the heavy armor and get a shield? Also, do I need the one handed weapon perks to do effective damage with them?

I'm really new to the game, so sorry for all the questions, and thanks in advance.