The biggest help for me are the plastic drawers on wheels ( they don't have to have wheels because I don't move them. It's 18 inches wide, 2 small drawers and 2 deep ones. Cutters, blades, small scissors, needles etc on top drawer, screw drivers, large scissors and other tools 2nd drawer. Cone thread in the 2 deep drawers.
Another big helper is a slotted wood ruler holder that sits on the end of my sewing desk, it liens on the wall, I love having the different size rulers handy.
A copy of my pantos in a binder, rather than unrolling and showing to customers.