AFAIK, it's hard to get a registered copy of Miami, as the developers has stopped supporting it.
There are shareware versions and pirate-keys availible on the net, though. Google is your friend! :-D
You'll prolly need a driver for the card. There is one on Aminet called C-net, or something like that.
You can read PC-floppies on your miggy, assuming they're 720k floppies (or that you have a HD-drive in your miggy). You'll need Cross-DOS to do it. If you have Workbench installed on your harddrive, it should be enough to type "mount pc0:" in the "Execute command"-box.