In home or offsite?I don't know about Texas, but I think your first call should be to the State Dept of Health and find out about what types of food handling/sanitation permits you need. Kitchen if you own or are renting.
Obviously business licenses, insurance.
I don't know of any State (except in rare instances for baked goods MAYBE in NH) that allows out of home catering, but that doesn't discount personal chefs or private in-home catering (meaning you use the client's kitchen for parties and such.
Hope this helps.