Congratulations on your new rig!
First thing you need to check is the HW heater, make sure the annode is installed. I always remove mine to drain the HW heater prior to winterizing. then you need to switch the water heater bypass valve back to "Normal" from "Bypass". hook up the city water fill connection and open the furthest hot water faucet and turn you water supply on. It will blow air for quite a while before the HW tank fills. once water starts to flow, go to each faucet and turn on until all air is out and you get even flow. Shut all valves and your good. Now you can fill your onboard FW tank and use the pump. Trying to dewinterize from the FW tank and pump takes a lot longer than a city water connection.
The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD