RE: How to hook up all the wires
As for the three wires coming off your switch - one goes to the charge jack, one goes to the battery, and one goes to the RX. If your RX doesn't have a port labelled "battery", then just plug it into any port you are not using (flaps, gear...).
If you accidentally mix up the switch wires for the RX and charge jack, then off will be on and on will be off.
I like to plug everything into the rx while it is still hanging out of the plane, and make sure that EVERYTHING is functioning correctly BEFORE I bury it all inside the fuse. You may also want to either shrink wrap or tape together any connectors that do not need to be routinely disassembled.
Good luck.