Karin, WELCOME! You'll be a seasoned RVer before long!
That RV Repair/Maint book is by author Bob Livingston and it's very good. Will help you a lot. What it won't help much with is the specific locations of things like valves, and info like capacities of tanks. But Eric's comment is right - Most RV "Owner Manuals" are very generic and don't tell you those things either. For example, the Manual for our coach in signature says "Fresh Water Tank is under a Sofa or Cabinet." Nope, it's under the Coach Body. That's a pretty radical difference.
