Yes, you do need a greencard to live in the States of America.
No, Certainly not.
yes
How you can get greencard if you work with visa J1?"
Depends how much money they have but for this you would need millions.
Yes, but you need unexpired Passport from country of origin also.
You can get a greencard if a US citizen familiy member, relative or fiancee petition you.
greencard holder gets a fellony does he get deported
Yes, in order to audition for American Idol you need to live in America.
You have a strong enough argument to take action. Contact the people who issued the greencard.
yes.
depends on your schedule. honestly, this isn't a very good question. is your job in america or something? if you live in america, then you have no need to go there.
All you need to do is stay in contact.