Normally I tell people to go to RVBookstore.com which was an excellent resource for just about anything related to RVs and RVing. But I just went to the site - which looks new - and many of the links gave me the message "Oops! That page can?t be found." If it ever works again, it's a good site! Maybe they're revising the site.
Meanwhile I suggest trying the Barnes & Noble, Camping World, and Google Books sites. They all have RVing books. If you want something specific, such as RV Roof Maintenance and Repair, just Google it and you'll probably find something useful. Of course, there's also our own Library (above left button) which has numerous articles written by our own RV Forum members. It includes lots of checklists which are useful for buying and using your first RV.
ArdraF