Gas lines are simple. You set up a clunk in the tank that won't quite reach the back on the tank and that tilts freely so that it can pick up the fuel in any position. It's good practice to put a piece of tubing in the middle of the clunk line in the tank so it can't get stuck in the front in a bouncy landing. You also need vent line that is pointed to the uppermost part of the tank when the plane is sitting on the ground. On the outside of the tank. the clunk line runs to the carb intake and the vent runs out the bottom of the cowl for the times you overfill the tank and spill some gas.
As for power setup, you can do it a couple of different ways. The simplest way is a two battery setup. That's two batteries and two switches, one for the ignition and the other for the receiver. You also need an optical kill switch for the engine. Option two is to use one bigger battery or a pair of batteries wired in parallel to a common connector then splitting off to the receiver and an IBEC to power the ignition. The advantage to the second setup is either the ability to save some weight by only having one battery or redundancy- if a switch or a connector fails, you'll still have a battery to power the whole plane.