For starters, what kind of car are you trying to set the timing on?

Many, many late model cars have non-sdjustable timing. Ignition timing will be controlled by the ECU and there is no adjustment.

Some cars, like my '90 Hatch have a very small amount of timing adjustment.

Depending on what kind of car it is, you might only be able to check the timing with a light. The way to use the timing light is to connect the alligator clips to the positive and negative terminals, and then clamp the inductive coil around the number 1 spark plug wire. Then start the car, aim the light at the crank pulley, or in some cases flywheel, and look for the timing marks.