how to get those player bonuses? i got one, but i don't know how??

you receive them random by winning matches.

g3ck0

ty... so thats something special...
a last question...

what about a players power??

Player's power is a combination of player's skill, morale and stamina.
It affects on overall avg of the players on the field. You can improve it with masseur, psychologist or trainer - by increasing player's skills.

Hope i helped.