Need advice

Bass Man wrote:
I just set up my camper and the toilet black water is over flowing. What's the issue??

Like other's have said sounds like you've got your hose hooked up to the wrong connection. The one labeled "city water" is the one you want if you are on full hookups.
Don't worry, we've all made mistakes along the way. It's part of life. We've been camping for many years and have made quite a few along the journey.