Don't invite anyone else to go with you without asking, and don't even ask until you do work for the guy and hunt there for a while to let him know you appreciate it and are responsible to take care of his property without disturbing him or being in his way, etc. The worst thing you can do next to littering or rutting up his fields with tire tracks in the mud is invite a friend with you when only you were given permission to hunt.

Congratulations!