Actually, there are two basic ways to copy your data over. The easiest way is to Master/Slave it. It will reduce the transer time needed to copy the files. (Actually there many ways: network, CD-R etc.)
The other is to get a IDE/USB/Firewire adapter. Plug your HDD into the adapter and the PC will recognize it as a Mass Storage Device. This is a little more work and much more money.
What kind of hard drive are you trying to setup as slave. I have a book on old hard drive configurations and I might be able to look it up for you. All I need is Manufacturer and Model number.