First motorhome

With zero experience you are going to be spending a lot of money on having RV service shops do the repairs and replacements on the components in an older unit. It is not impossible to find one in excellent condition but that means the owners did all of the repairs and replacing which is usually reflected in the price. Don't buy anything pre-owned without a through inspection of both the RV coach/components/appliances and the mechanics of the van. This will be a small investment over what it will cost you when you find out after you buy that it needs a new tank, a new hot water heater, or a new transmission, etc.