The great thing is you learned before you invested. I have a very small cart and offer:
Spicy Hot Links
Also offer chili and cheese to any of the dogs and sausages.
I think I have a pretty diverse menu. But if you have your heart set on a more entailed menu, this info doesn’t matter much. All the above items are precooked and are considered non-hazardous by most HD. It’s usually a big jump investment wise to go from this to raw meat and other ‘hazardous’ ingredients. Being in NY,NY I’m sure everything is pretty set, but I would check all the vendors there. You will find out just what kind of rig you can get by with.