2: Learn what your character needs based on your playing style, If you have issues with life, start rounds with an HP regen ring (400 gold) If you have issues with mana, Get mana regen shit, If you use minions, USE THOSE DAMN AURAS!
It might not be this simple. You may just be playing the hero wrong, such as casting way more than you should be. If you play the hero correctly, you can buy items to improve your stats, offense, and survivability instead of having to buy regen.

New players should always look up skill and item builds on YouTube before playing a hero they haven't tried before.