I personally started in JPEG but as soon as I saw what RAW could do I havent looked back - I shoot every shot in RAW. True that processing wise it does take longer and may not be comercially viable but for me just shooting mainly for fun, I find it excellent.
I pop all my RAW shots on to PC (5mb each) then slideshow them through Rawshooter, a free programme which is excellent and choose the ones I like. It allows you to make corrections to any shot that you could have done with the camera (other than focusing) - exposure values, white balance, colours etc and you can run it as a batch if you require. Still no substitute for taking a great shot in the first place but as I've said before, it's an option to use if you wish.
Files are then converted to TIFFs which can be quite large - around 35meg for my 6.1 MP shots but TIFFs from the way I understand it are pure - no compression at all, which JPEG does do. Once I'm really happy with it I save it down to the size required and post it up.
I took me a short while to get to grips with it but overalll if you are happy with editing JPEGs, there's little difference. Best way is to try it on something that you can experiment on and just play around with the software and see how you get on. If you don't like it..fair enough.
PS - working in TIFFs is very heavy on the PC - I wouldn't attempt it without a reasonable spec machine ( say 2Ghz processor with 1 GB ram and a reasonable graphics card) otherwise it may well be a lesson in frustration.
Have fun!