New to the forum thing so bear with me please !

I just bought a 73 Winnebago Brave, my first RV ever, and I find myself just walking around sitting in it looking around at everything. I believe my wife thinks I've got issues ! Needless to say I'm clueless about just about everything to do with RV'ing. I'm blessed with a little bit of mechanical so hopefully all will turn out well.
Our RV is the 22' variety on the the RM300 chassis with the Dodge 440. It has 30,000 miles on the chassis and the interior is all original, it's like stepping into a time capsule. LOL So far I've found the brakes are the victim of sitting, rusted and pitted rotors etc. The engine runs descent but seems as thought its in need of a good tune-up and possibly a carb rebuild or replacement. The plug wires feel like they'd snap in half if bent too far. The interior is in really good shape, original carpet and curtains and all of the wood work is nice.
The first problem I want to tackle is a leak in a water line that was likely the victim of improper winterization. It seems that the leak is coming from under the shower stall floor. Any words of advice before I start on my quest to find the origin of this leak?
Thanks