Hi & welcome. I presume you have the Dodge Brougham Class C motorhome rather than the Dodge Monaco Brougham car. A 1974 qualifies as an antique vehicle as well as a vintage motorhome, but the basics of RV equipment & usage haven't really changed all that much. Still, anything that old is going to be an ongoing project & potential money pit.
You will surely have questions, so feel free to post them here as they arise. It's best to put individual questions in separate posts so that the answers don't get jumbled together.