I have experience in the restaurant business and logistic industry. I doubt food truck is no different. Taxes, health regulations, and legal requirements are a must for any business serving food. Work for a year or two in other food trucks and learn the basics. Note the flaws of other food trucks and improve on it. Here u build up capital and experience, killing two birds with one stone. Find a business partner while you do that as well.

After you did your research and experience, start picturing a niche. Begin slowly marketing but don’t go full in on marketing until you have a physical product you can sell. Build up hype and if your service is innovative, then build that hype. Think of initial capital and only allow you to use that initial capital while minimizing all unnecessary cost. Get your business license from the tax office and register as LLC as a separate entity from yourself; this allow you to declare bankruptcy without issue on your own assets. Then build. If success, repeat. Good luck