All pots are really variable resistor dividers. Usually, the two outter pins are the ends of the divider and the middle pin is the wiper that goes up and down. To use it as a variable resistor, you only need one resistor in the variable resistive divider- you pick any one of the outer two pins and use the middle wiper pin, completely ignoring the other end pin.
It takes a lot of work to lay out a PCB- something that no one is going to do for you unless they're paid a heft sum. Best just to download the software and learn to use it yourself. ANd on a breadboard? Well, stick the parts on a breadboard and wire them together...there's way more than one way to do it and everyone does it differently, just like laying out a PCB.