Don’t know where you’re at, but I think that Kirkwood Community College here in CR has a few classes on outboard and small engine repair (used to anyways). I would check around at some of the other community colleges and tech schools to see if there is something you could take for a couple hundred bucks to get started.
If you find one, let us know – I wouldn’t mind taking one. I’ve been doing engine work since I was about 5, but outboards intimidate me something fierce because of the way they cram everything in under the cowling. Multi-cylinder two-strokes can’t be all that fun to tune, either.
Of course, I’ve worked on a lot of street bikes, which can’t really be much better; I can still fish without the bike, though.