If you're new to flying quadcopters, the first thing you should do is buy a Hubsan X4:
Yes, I know... it looks like a toy, right? Don't be fooled by the appearance or low price. The Hubsan X4 is an impressive quadcopter that will allow you to practice a range of flight manoeuvres before you move onto a bigger quad. This is very important for a number of reasons:
Flying a quadcopter isn't as easy as great pilots like Charpu and Metalldanny make it look.
You will crash a lot whilst you are learning to fly.
Crashing a full-size quadcopter can be dangerous and expensive.
So please, take our advice and the advice of every seasoned quadcopter pilot who answers this question on a forum: Start with a micro quad. You will have fun and learn how to fly in a safe and inexpensive way. Most of us started with a micro quad like the Hubsan X4. And those who didn't probably wish they had.