It should be as simple as installing a couple of cables. Hopefully you've got a nice flat cable either with the new slave drive, or a spare with the motherboard: it's normally red, but can be other colours, about 1cm wide and 1mm thick. That needs to be plugged in between the drive and one of your SATA slots on the motherboard. They'll normally be black, and unlike most, will have a slight 'L' shape to them. If you get a torch on your motherboard, you should see SATA1 or SATA2 written very close to them. If you've already got a SATA drive, then it should be easy to spot, so just use the second port.
When you start the machine up, go into the BIOS by pressing the appropriate key (it should come up with a screen just after displaying what graphics card you have / testing memory, telling you what key to press - normally F1, F2, F12, Esc or Del),
Then find your way to the 'Boot Order' section (sorry, not sure quite where it'll be for your chipset - but it'll be either on the first screen, or more likely a menu off of it), and make sure that it's still on your CD/Floppy/original drive first and hasn't swapped to your new SATA (it shouldn't have done, but some prefer a SATA drive by default to an IDE).
Any probs or questions, please come back. You'll do fine!
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