When youstart to battle, put a flame spell in each hand. Do not just push the triggers to fry someone, but push and release, push and release. This way your magicka builds faster and stays up there better when in battle. It makes it so that your magicka refills faster. Hope that made sense. With fire spells, the target will still burn a little after the triggers are releases.
Follow your chosen one to Riverwood, sell your plunder in the store(s), and head up the path like you are going to Bleak Falls Barrow. Kill the bandits there and the ones outside of Bleak Falls Barrow. This will give you some experience. You can then sell that plunder. DO NOT buy spells from the court wizard, but from the people at the college cause they are a little cheaper.
I would put all my points into magicka, and forget about health and stamina. I would also go with destruction as your bread and butter, conjuration for helpers, illusion for frenzy, alchemy, enchanting and a little bit of sneak. I also understand that each person has there own way of playing, and these are just suggestions.
Then after you get to Whiterun take the carriage to Winterhold, and save before going up the ramp. You will be getting your first spell and if the spell is not to your liking you can reload and do it again.
Destruction - novice, dual casting, impact, apprentice, augumented flames 2, augumented frost 2 (for the fire dragons), adept, deep freeze, expert and master.
Illusion - all the spells but dual casting
Conjuration - just the main ones, like novice, apprentice, etc
Resteration - for the necromage perk
Sneak - stealth 1, and up the left side to silence (if you are going to sneak)
Hope this helps you out. Anything else you need, send me a pm (message) and I will try.