What happen if I buy a loaned player for another team? This player will come to my team? If not, who will pay his wage?

yes, the loan agreement will be void, and he will be your player, unless you decide to loan him again:)

Hum, thanks.

And another doubt: if a loan a player with wage 100% and players wage change (contract renew). What happen?

unless the loan agreement is renewed, the loaning club will continue to pay the previously agreed amount:) (regardless of new contract the player signs with the parent club)