A) You can transfer the files via iTunes (to the iOS device, from the iOS device)
Open iTunes -> 'Your_iPad' -> apps (in the middle, the 'big' frame) -> FileMaker Go -> drag&drop (make sure, the iOS device is NOT in sleep mode
B) You can have a FileMaker Server with a fix/dynamic IP
there are also 3rd party-products to sync a local FileMaker Go database with another one on the MacBook (SeedCode, etc)
@markus: thanx, itunes works!
@Phil: dropbox was not an option. I wil study your link,
thank you both
I will note that DropBox is free and makes moving files between Pro and GO much simpler than iTunes.