You are absolutely correct, your boating experience will serve you well. I owned sailboats for years before transitioning to RVs, the last being a Catalina 30. It sounds like you made a great purchase.
By and large the systems are the same and trouble-shooting, repair and replacement will be second nature to you. One of my biggest beefs with the RV community is their love of gooping sealant on nice and thick until your roof looks like a flock of seagulls have been living on it. As a former boater, you know that it's the sealant between the fixture and the deck that counts, not five generations of additional sealant. Make this your first priority. And, although it's not boaty, read up on using Eternabond tape. Winnebago's specified sealant part # for roof fittings cross-references to Manus Bond 75 AM, available on Amazon. Many owners use the ubiquitous Dicor but it's made for rubber roofs, not fiberglass. I prefer to use Winnebago's recommended sealants.
Two priorities to research are treating your roof edges and making sure you don't have the dreaded Winnebago windshield leak. You'll find that the Google search box at the top of the forum page is the best way to search.
Here are some useful links: