Given below steps will help you.
1. Purchase your hot dog carts. Check the ordinances in your state before you buy, as each state has its own requirements for mobile food units. For example, the Houston Food Ordinance defines a mobile food unit as one that is easily movable, rather than a "fixed location" food unit, and different rules apply for a trailer that operates in a fixed location.
2. Register your business using the application forms on the U.S. Small Business Administration's website. You will also have to register your "doing business as" or DBA name, which is not necessarily the same as your legal name.
3. Submit your application to register for state business and income tax, as well as sales tax. If you plan to employ workers, you will also need an employer tax identification number.
4. Find out what business licenses and permits you need to operate in your state. In some areas, a state license to operate hot dog carts may mean you do not need a local county or city permit, but in other states you may need both. You may also need to apply for a mobile vendor permit for each cart, to be able to serve food from the carts.
5. Check the food safety and health regulations for your state using the National Association of Hot Dog Vendors' database. State governments have various requirements for the serving of food, particularly from mobile units, and you and your staff may need to complete food-handling certificates or obtain food safety qualifications. Illinois, for example, has specific food safety requirements, which hot dog vendors must comply with to retain their license to operate.
6. Find locations where you have a high concentration of pedestrian traffic. You may decide to set up in public places such as on the sidewalk at the beach, or you can choose privately owned locations such as the parking ground outside a major store or shopping mall. You will need permits for most public locations, while private locations are likely to charge you rental for the space or a percentage of your revenue.
7. Market your carts using on-site signage, business cards and flyers dropped at surrounding office buildings. Offer "frequent buyer" coupons that give the holders a discount after a certain number of purchases. Apply for permission to operate at festivals and events, which can be lucrative short-term operations.
8. Maintain high standards of food quality and service. This will result in your clients promoting your carts by word of mouth and help you to establish a good reputation.