Wont start

I just put a used engine in my car. I hooked everything up and try to start it, I have power I have fuel, starters good, batteries good, but it will not crank or start. I do not have power to the starter when the key is in the crank position the little wire on the starter that turns the cell annoyed has no power. I know it is electrical, but I do not know where to look first. What do I do to find the problem? Everything is good on the car I have fuel I have electric to the spark plug, s but the car will not crank when I try to start it. I hear a clicking sound on the passenger side under the glove box. What do I do next? Can someone please help me?