Install a scsi cdrom. This is probably the best way of doing things other than having a network card.
You'll probably need to get the driver to the amiga along with LHA and a few other utilities if you're not fully setup.
If you are running kickstart 2.1 you can mount 720Kb dos (fat) diskettes by using the PC0: device in the dos drivers drawer. This is probably the best way of getting started.
Another option is to get amiga explorer from amiga forever (transfers files over a null modem serial link).
