Owners manual and basics help!!!!

Sorry I havent got back to you in a minute. As far as I can tell, its a 26 foot eldorado motor corp coach/ econoline 350. I have looked through most of it, well the things that I know, and there are minor leaks, little damage and so thats good. I was planning a tire set for it because I dont trust older tires. I ended up fixing the fridge myself and works...yay. I bought a dogbone and got it plugged into my current house so I can go through and see how everything runs. On the control panel it says it has an inverter on it. What does that do? If it is plugged into a power source, is it going to charge both my main batteries or just one? I hate electrical so I will be cautious and prob let the pros help. It doesnt have a heater at all but I have a great little convection heater for the cold nights. I know that it will take up allot of wattage but worth it. It has an Onan emerald I genset and runs like a champ. Thankfully. I have tried looking up the names of products that I have found and most are extinct. Oh well. But hey, we are in it for the adventure right? I love figurng things out so totally worth it. And to the person that talked about trying to find a place to park near a hospital, I have an answer. Towing my car behind. I know that the older motor is expensive but for the money this gets us started. I am living off of my veterans disability. But she and I have wanted to travel and being that its expensive to travel and find hotel rooms and thats no fun anyway. Our plan is to fix up what needs it within reason and go for a couple trial runs before we go for broke so to speak. I really appreciate all your help with giving me ideas and tips. I am soo impressed with the RVing community already. Thank you