I decided I just want to convert old midi music for fun right now, since I am still experimenting with the instruments. Until it sounds perfect, I am not taking this seriously.
Hey, don't despair ;) Just have fun :p
I've been listening to any kind of MIDIs (General MIDI, DF XMID etc.) for a very long time.
You'll soon find it very boring because it either all sounds similar (before: all same crap, and after: all same preferred sounds) and you simply can't make them all sound good.
Doing things for fun is one of the best ways to learn things or get better at them. If you have fun, it's much easier to get around to doing it and so you do it more often. (Although some days I have trouble getting around to anything, fun or not:).)