Amitar, there used to be an Amiga shop in Perth by that name...
Q: How do I transfer my rom to the PC to use in the emulator? or is it just easier to buy the roms?
A: You can legally download the -same- rom version as the one(s) you already own. ie if you have an A500, you can freely d/l 1.2 or 1.3 depending which one is in the machine.
Q: How do I transfer all of my games to the PC?
A: There are a few ways, (google) I used to do it the hardest way, which was to create the ADF on my real amiga then copy that to a PC formatted floppy using a HD external floppy drive. Its awkward and kludgy, but it works. A easier way if you have a quick connection, is just to look for the games on the net.
amiga.supergamez.hu/
Have fun!