Welcome to Steel Soldiers, and good luck with your new truck! We would love to see some photos, when you get a chance to post some. All of my lighting issues were solved by replacing bulbs. If none of your lights work, I would suspect the 3 way switch is either set wrong, or possibly has loose contacts. Troubleshooting procedures are all in the TMs, and wiring on these trucks is fairly simple, as long as it is all stock and no one has monkeyed with it. If you get stuck, feel free to "ask the experts". Folks on here are happy to help, and they know every nut and bolt on these trucks.
Again, welcome.