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You can't sell to an other server from what I know, whats why you can't make offers to other players who are not on same server with you.

You can't, all what you can do is to "sack" them but I don't think you want to do that, or to wait till new season start so you can sell them.

Yes, for exemple you are level 10 (highest) and you want to sell a 6 stars player, he should appere for level 11 (there is no level 11) so nobody will see them.

And if you are the highest to who you want to sell 6 stars players as long they don't appere on transfers list if they are 6 stars.

On your server do you have others highest in rank then you?