I can't find a manual for this model, however there is a general hobbylock book http://sewingonline.co.uk/library/know-your-pfaff-hobbylock.html
which would certainly be a good start.
You may find best source is to contact Pfaff locally and source it from them direct.
You could also try www.diplodocs.com
, I can't see this manual but if you go through similar model numbers manuals you may see one very similar. Overlockers/Sergers are very similar in many ways so once you've mastered one, the next one is pretty straight forward. Four tension knobs, 2 needles and 2 loopers is the norm - to get a three thread stitch you just don't thread one of the needles. Tension adjustments alter the stitch formation, and you should have a stitch length knob on the right side of the machine along with a flywheel and if it has it, differential feed (which controls the feed dogs so you can stretch, or compress the fabric as it goes under the foot).
There are some good general how to use a serger books in the marketplace too which should help. Threading up, many machines have a diagram inside the front flap, colour coded dots on the knobs, eyelets and loopers. And oiling points are often marked on this diagram too. But basically oil the two loopers where they slide/move on another metal part. Some good info here too http://sewing.about.com/od/sergersoverlock/Sergers_Overlock_Sewing_Machines.htm
Hope this assists you a little.