There are several options. You could find someone to send you some 800k system disks, or you could find another old Mac that has a 1.44MB floppy drive and use that to copy the files from the PC disks to 800k Mac disks. You could also use something like a Zip drive that you can copy files to from the PC and read on the Mac.

Easiest is probably to get some disks from another member here. Offer to pay for the blanks and the postage and I'm sure someone can help you out.