Should be capable of decent accuracy with a PRB. I'd stay with Pyrodex or BP as suggested. Probable start off at around 80 grains & work up. I expect 2" or better groups at 50 yards with any of my muzzleloaders. If it wont do that well with a PRB try a conical.
As for cleaning - EVERY time you shoot it! The hooked breech makes cleaning easy. Just remove the barrel, remove the nipple, and throw the nipple in the bucket of hot soapy water you're going to use for the barrel. Wet a patch, stick the breech in the bucket, run the patch bownbore on the cleaning rod& "pump" water up & down in the barrel several times. Change patches & repeat until the patch stays white. Run a few dry patches through, let it set & completely dry while you're cleaning the nipple, hammer, lock, etc. When everything's clean, oil, re-assemble, and that's it!