They're taking forever - cant wait longer.

So I bought the Lumia 800. I was going to wait for the 820 to replace my battered iPhone 3G, the iPhone's home button is broken so it was a pain in the neck to use. Today I decided I had enough and went in my local Nokia shop to go home with a Lumia 800.

So tell me guys, what are the must haves and must dos? This is my first time on a Windows Phone.

Also I could not set-up my e-mail, I entered the right username and password (I'm certain) but it says I've got it wrong. Is this a known problem? It's gmail btw if that helps.