The MS2000 is a great synth, microkorg engine with a proper amount of knobs. Great for synthpop. Just delve in and muck around, you'll soon figure out what does what.
Shame about the 303. They're not super rare or valuable but a lot of fun to play with. Lots of the early madlib stuff was made on them, and they're still well regarded in the lofi hiphop scene, although most have moved on to the 404 and 404SX now.
What are you recording with? Ableton Live is kinda standard these days, really easy to get your head around and lets you do pretty much anything you can imagine. Although any DAW will get you there..