Haha, sure we can do that. So you don't yet have an ST? Also there are SOME restrictions, you can't just write to any old floppy willy-nilly. Depending on your ST model and stuff, you may or may not be able to use single- or double-sided disks, and other stuff. The link I found that helped me sort it all out is here: http://www.atari-forum.com/viewtopic.ph
mp;t=9481.
In it, there's a good tip on formatting disks to make sure they're readable by your Atari: "In Win XP type this in command prompt: format a: /t:80 /n:9 It will produce 720KB floppy, usable on all Ataris."
There's also information in there about utilities that would (I assume you don't need this, but others may be interested) let you rip your old Atari ST discs to image files (like an .iso of a CD/DVD nowadays), or to use ST image files to make ST discs.
But if you're just looking to use a free and modern program such as MaxYMiser, you can drag and drop files to a disk pretty easily.
However, make sure the disk drive in your PC works! A lot of old floppy drives are probably pieces of junk by now, I had to buy a new one when I got my ST last year.