Hey Buggs, as a fairly new welder myself, the only advise I'm in position to give you is to just start welding stuff. Just dive into it...since you want to do bodywork on the jeep, get some thin gauge steels to practice on a little bit, and then just dive into work on the jeep. The welds don't have to be perfect to be good enough, and good enough is perfectly fine for what most of us here are doing with welders. Just make sure you have an angle grinder with both cut-off and flap sanding discs, you'll be using all that. Some people will call you a grinder, not a welder, oh well. All self-taught welders start off as grinders, it's fine. Go on Youtube, there's a lot of welders out there sharing great tips. Strange Garage and Love2boat92, those guys on youtube have some good fcaw vids, check them out.
Here's vids I have on my favorites list on youtube, for welding (instructionals), there's some real good flux core topics in there:
welding - YouTube