First thing I would do is remove the built in filter outside or replace it with an inline filter.
This just may save you a major headache later.
Once you are setup in your site you need to flush the lines with the city water hookup.
Open the low point drains under your unit to flush them do the same with the outside shower if you have one.
Open every faucet inside and run them until they are running clear and no foam.
Flush the toilet till it is running clear, press and hold.
Turn off the water to your unit.
Replace the caps on the low points.
The water heater bypass valves need to be set for normal use.
Turn the water back on.
Open the pressure relief valve on the water heater.
Close it once you have good flow and no air bubbles.