Yes start off slow, that way everytime you add something new, you can change your advertisement literature, or however you promote yourself. Pay attention to the number and quality of the added customer responses to both your recent additions of service, and the way you advertised them.
I would start small and grow. If you start big you will eventually either get burned out or lose business by not offering what the public really wants.
Q1: Should I start out with all my ideas or just start small and add as it gets more customers. ice cream, candy, cotton candy, popcorn, ect.
Love this idea.