You can only have 1 avatar per profile. You can create 3 avatars but from different profiles. You will also need to buy 3 different subscriptions if you want Xbox Live Gold.
No.
No.
To get your avatar back on Xbox 360, sign in to your Xbox Live account on the console. Once logged in, your avatar should automatically be retrieved from the Xbox Live server. If it doesn't appear, check your account settings or try restarting the console. If issues persist, consider re-downloading your profile from the Xbox Live service.
Yes
you can create an avatar then change it but no you can not crete two accounts with the same email if it will be on xbox live
if this the xbox live avatar you have to buy the prop(s)
No, just recover your gamertag on Xbox Live.
No. yes
yes
yes i need them which games have them
The world may never know
Yes, it has a multiplayer mode that uses Xbox LIVE to work. Avatar isn't a very popular game; not many people play it, thus WAAAY slower search times. You can do things such as CTF, Team Deathmatch, King of the Hill, and much more. Plus, on multiplayer you can choose if you are RDA or Na'vi. Sadly, you CANNOT play campaign on Avatar on LIVE.