I am moving a mobile home that has 100 amp service in but my pole is a 200 amp service coming in with a 200 amp breaker on pole how do I downgrade to 100 amp or do I just find a 200 amp fuse box to install and if so will the wiring in a 100 amp home do with a 200 amp service

You can use the 200 Amp feeder from the 200 Amp service and connect to a 100 Amp Main Breaker in the panel.