If you want to use a PC floppy drive you'll also need a catweasel controller by
Individual Computers.
This will allow you to read a number of different disk types (Apple, PC, Amiga + more). The new catweasell III also allows you to plug in an A4000 keyboard and two Amiga joysticks though you may need a towered Amiga to use it (though it connects to clockport) - I'm not 100% sure on this though.
The old catweasel my be sold out so you'll have to try Amibench or ebay.
Cheers,
J