A few more thoughts.....
If yer still gonna sell dogs, how many pans will you have available? Might wanna stick to the basic beef at first. Actually, you might create a "Taco Dog". Taco stuff on a dog. Or a "Walkin' Taco" A bag of chips, cut open longways and topped with whatever you got.
Define your expected customers. Latinos that want the real thing and/or Gringos that may want things Americanized. Gringos may want cheese, sour cream, lettuce and/or tomato. This could evolve as you progress.
If you have garden space, try to grow as much as possible. I love telling people that the peppers in their chili were still growing this morning.
And learn some basic Spanish (there's an App for that). It shows respect and is a way to make friends. The Latino community is usually pretty closeknit. They WILL spread the word, if your food is good and they feel comfortable with you.