All of the above posts are really good information. I agree most with Pgh Bob, Think of a Class C motorhome two different ways. The "HOUSE" and the "TRUCK".
Maintaining a Class C coach is not much different than maintaining your regular car, oil change, air filters, tire pressures, etc.
As far as the "House" part goes, You only have a few things to learn about. The Refrigerator, water heater, AC unit, water pump, slide operation (if you have a slide) Battery Care, and Generator Operation, Awning operation, etc.
You are already in the best place to learn everything you need to know about RV'ing and that is here! Welcome to the Forums! Just post a question about one particular thing and you will get dozens of responses in a very short time.
Learn from our mistakes, and you will be a happy camper for sure!
Oh, BTW- Learn this lesson first! If you do deploy the awning, don't set it out level. I know it looks better level, but leave one end lower than the other. If you don't, and it rains....You will have a swimming pool in your awning and it will tear itself off the motorhome. Ask me how I know! :)
Congrats on the new to you rig! And welcome!
Hope you have an awesome time learning everything!
Good Luck
SK