The simple way is to burn your data to CD / DVD and pop the disk into your Mac.
Remember not all PC software files are Mac compatible. If you have PC specific software that you need to use ...... install Parallels or Bootcamp and Windows.
Can you connect the two computers with a network. Once they are both on the same network you can "share" your files on the PC and the shared folder can appear on the Mac.
If you can't do the network then you can use an external USB disk drive. plug it into the PC copy your files there, then plug it into the Mac and copy them off. You will need an external drive for backups anyways. So if yu don't have one, get one.
Yes my friend, get your self a USB flsh drive and just put all of your files in there from your pc then pass all of your data to you new MAC. Again, Congrads on your new Mac. Best machines ever.
I'd recommend FTP, if you can. Secondly, if you can share files over a network I'd recommend that as well.If those two don't work, go out and get yourself a usb drive. AS A LAST RESORT you could burn to CD/DVD.