I believe I bought
this one. Not sure it is exactly a beginners "guide" but I felt it could be a helpful resource to have on board. We're pretty handy and I read this forum A TON (for years) before buying, and continue to read now. That's where I learned most everything I know. You have to know how to sort the good advice from the questionable, but every question gets asked over and over and you eventually end up with an amazing education.
Many of the mods we've made have been based on reading others' experiences and deciding to prevent them before they have a chance happen to us (e.g.
an awning lock). I think DH thought I was being too cautious until he was following behind an RV in WY whose awning ripped off in the wind (almost hitting DH's car). Anyway, I like the upgrades and he appreciates them as well.
I don't know at what level of "beginning" you are, but what I read between the lines of some of the prior responses was maybe you should try renting (if you haven't already) to ensure you like the RV lifestyle. It's also a GREAT way to learn what you like/don't like in an RV.