I need to make slots in both sides of my drawers and yet I am not sure how to proceed to be sure that the slots are in the middle of the drawer side width as well as what to use for a stop in order to make sure that where I stop is the same on all the drawers as they are not all the same width and yet are the same length.

Any help you can offer would be greatly appreciated and I do own a small router table.

Thank You
Benny