Folks, I am getting ready to do some wiring for nav lights and a plug for the troller. I am a complete novice when it comes to this. I need direction ! I dont even know where to start. Thinking of getting a Battery Tender plug, but am clueless how you attach it to the battery/trolling motor. Do I need to get a seperate battery for the ligjts. Any other items I am forgetting about? Thanks !