Firstly connect your Xbox 360 to the internet via wireless or wired. When you have done this, you will need to sign up for Xbox live, this is on the dashboard, something called join xbox live. Go through the setup and you will you will be live. You will need a Xbox live gold membership to be fully online.
XBOX Live.
You have to pay for xbox live.
No.
go to xbox LIVE marketplace and there is a huge list of downloads
Every Xbox 360 console has the capability of connecting to Xbox Live.
when you get live you create a gamertag
No, it is a download from XBox Live Arcade.
No.
yes
*Gamertag, is your name in which you go by on xbox live
you can pay online, got to xbox360.com/live
Blue Yeti is a type on condenser microphone. You cannot hook one to an Xbox360 and talk to people on Xbox live.