[MrForbes]

The ohm rating on a potentiometer (pot) is it's resistance. All a pot is really is just a resistor with a center contact that you can move.

You can get pots with all different resistances, which one you want depends on the circuit you're making. If you are going to use it to replace a joystick, then you'd probably want to use a pot with a resistance in the neighborhood of 10,000 to 100,000 (10k to 100k) ohms.