New trailer. Lots of questions

Thanks everyone for your responses. The maiden voyage of our new trailer was a success. We filled up the freshwater tank upon arrival at the campground. two nights later when we left the freshwater tank was near empty and the grey water was full and the black water showed 1/3. stopped at the dump station on the way out and since we were the only ones with tanks took my time in emptying both tanks. No one else waiting so I got the first time out of the way. I'm a lot more comfortable with the process now. We did find a few things that we need to improve on. With our popup we had a routine for setting up and breaking down. We have not yet got that down pat wit this trailer but we're getting there. We also found the mattress very firm so added a 3 inch foam topper to it. I tried to put the water heater on electric and it never warmed up so flipped it to gas. At home cleaning out the camper from the weekend I opened the circuit breaker box and noticed the circuit for the water heater had tripped. Don;t think it was my efforts that tripped it it may have been that way from the purchase for all I know I never tried it on electric at home because I was only on a 15 amp circuit. All in all a good first time out.