Browse the online database for the Monkey Machine, odds are you'll be able to get some insight into the problem by looking at what other people are doing. To browse, start the application then select 'Download Beat' from the file menu.
http://www.rinki.net/pekka/monkey/
But that's just me. I learn best when I examine someone else's work and then adapt it to myself, other people might suggest more structured methods.
Zoom effects pedals come with a bunch of drum loops too, if you just want to jam that might be an option.