Making the switch from a PC to a Mac… HELP!!!

I’ve been using WordPress with a PC, but it’s about to die, so I’ve bought a new computer. A Mac. I have NO IDEA how to move my blog files to my Mac. I need a step-by-step, because I’ve got no idea. I usually just go to the WordPress login on my computer and edit using simple html and image add. I’ve downloaded the new WordPress files to my computer, and moved the old files to a different folder on the new computer, but I don’t know what to do with what files.

HELP!!!