Am I out of my depth?

I'd really like to beat the******outa who ever allowed it to get to the sorry state it's in. The fool I got it from knew NOTHING about it. Said one of the AC's worked but which one? Didn't know about a selector switch by the converter. U can only run 1 at a time or I the genset even worked! Had to tell him if not enough gas in tank won't run. Idiot the roof was pretty solid despite my fears. After scrubbing the aluminum with bleach I found some very small holes here and there from corrosion. Caulked them up but damage done. Was just stopping the bleeding so to speak
I'm sure I haven't found all the bad yet but as u can tell I'm quite the optimist and I'll need this forum more than ever! That's for sure