Hi Paul - Great Electrical Repair Question!
Lighting is pretty straight forward when using a single switch, however let me go over the basics: The Hot is attached through the switch, Neutrals splice right through, all together. It really does not matter where your switched hot enters the lights, just keep all the colors together, Black wires to Black wires, White wires to White wires, that is Hot's and Neutrals respectively. Grounds go all together as well, bonded to any metal boxes that are being used. I don't know what type of fixtures your installing, or the capability to junction wires if needed.