Brand new to anything but tent camping

If you are hooked up to park water, you may need to get a water pressure regulator. Pressure usually isn't a problem, but we did find out one time when we stayed in a large, but mostly empty park, that the water pressure was so high it blew right through our system. Big wet mess. We never traveled without one after that.

You will probably need a dedicated hose for potable water, too. One of those white ones.