The front lights are on a switch outside the trailer, front of the generator cabinet, road side under the overhang. One switch for the "loading lights" and one for the "accent" lights.
For the 3 water connections: top is for winterizing the rig, center is for "city water" or filling the fresh water tank, bottom is black tank flush. To fill tank, hook up to the city water then use the control valve (just to the right and a bit below the hose connection). The valve will be marked "normal flow" and "tank". Set the valve to desired use and turn on the water. There is no good way to monitor the tank filling - the electronic probe indicators help just a little but are historically inaccurate if they work at all. I fill mine until I hear/see water coming out of the overflow outlet. I'm not sure where that is on your rig - on mine it is just aft of the pass through storage box on the curb side (opposite of the water closet).
You do know about needing a pressure regulator on your water supply, correct? It is very easy to apply too much pressure to your RV system and have a broken line or leaks. Pressure MUST be regulated to something around a max of 45psi. Don't be fooled with the low cost "flow restrictor" commonly sold as a regulator - they only work during flowing conditions. Static pressure is not changed with these flow restriction devices. Spend just a few dollars more and get a true regulator that covers both static and flowing conditions. Something like this:
https://www.amazon.com/AccuMeter-Lea...s%2C225&sr=8-9
Hope that helps.