i'm sure you have a Shur-flo water pump. find out the model and go to their website for a manual.
there should be a red switch next to the command center.
ours is next to the DSI switch, for the water heater. you turn it on and should hear it run and yes, you let it run until it stops. if it doesn't stop, you either have no water or you have a water leak.
FR doesn't have anything other than the Shur-flo paperwork, in the owner's manual.
with no pics or trailer model number, it's hard to answer the hole question.