No problem being a newbie. Make sure you take a close look at your generator and look for a switch labeled A/C or ~... My coach has one which allows the gen to run without supplying power to the coach.
You should be able to plug into a 15/20 amp outlet using adapters available at RV shops or even Walmart. But, you'll probably have to go from your 50amp male to a 50/30 amp adapter then to a 30/20 amp adapter.
You'll want to plug in to shore power, find your inverter/charger, and see what happens with your batteries. Hopefully they will take and hold a charge and the coach will get the necessary power through your shoreline.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.
2007 Itasca Ellipse 40FD