What to check?

Hey guys, have not posted for ever. Looking for some advice. Been playing with my nomad and I have power to everything ,lights etc but when I turn the key I have nothing not even a click. Turned over for me many months ago ,one time but nothing since. Just wondering what steps I should take to try and track down the problem. Have been checking connections and cleaning them things seen in place. It is a 55 and has a 350 in it now. To make this Mopar related I am happy to report the Cuda is doing fine and fires up fine, too bad it is 10 below and snow is on the ground. Thanks and Merry Christmas to everyone.