Advice on restoring security

A thief stole my Honda Odyssey van and lucky it recovered within hours, the problem now is to restore normalcy and security. The thief still have my key with remote entry and I’m not sure if I can change the remote entry code so the person can not come back and steal it again. I was able to find used key remote on Ebay but not the OEM key with chip (2002 Honda Odyssey), can anyone direct me to the programming sequence for my new remote and a source for new key. Thanks in advance