No.
yes i need them which games have them
No.
you a little bit of space for your avatar character
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.
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)
Yes, you can but you will need XBOX Live. When you are on a different Xbox go into your sign in board and select "Download profile". there you will need to put in your email address and then your password.
No, just recover your gamertag on Xbox Live.
yes but u need enough memo to use the avatar
yes
No. yes