Sending at evening...

Hello. I'm a total newb 4 atari 8bit computers but I just found the awesome PoKey chiptunes online and ran out and bought a werking Atari 600xl! Yay. But anyways how do I get this tracker?
Also are there any old Atari carts or games that were made for the 8bit Atari computers?
Like is there a music program I can get that will run on the 600xl without having ot use a pc/link?

You need a SIO cable to your PC.  If you're running Windows you can use APE.

Here's a manual.