The RV is more like a house than a car. There is not one manual that tells it all. Like a house has instructions for the furnace, the stove, the water heater, etc. so the RV has manuals for each major item. So, like others have said, look on the websites of each major component, for a manual for that item. As for general operation, there are some generic manuals. I have found them to be so generic that you don't really learn much.
Use this forum to ask questions. None are too basic or too dumb. We were all newbies once and are here to help. Also, when you are camping, don't be afraid to ask questions of others at the campground. Speaking for myself, I am always glad to spend a few minutes with someone sharing what I know. I have mentored my SIL and DD with their 5th wheel and see them now helping others.
2012 Forest River Sunseeker 2300 Chevy