Its definitely been a learning experience for us, and we have learned along the way. But the key is, to keep going, because it gets better. The best way we have found to promote interest, is to get your current clients to come, and offer a free class if they bring a friend. This helps to spread by word of mouth, which is your best way to market. Have business cards ready, and a class schedule to give to every new person that comes, as well as a method to take down their email address, so you can put them in the know as to new changes or new classes, etc. It takes a lot of followthrough, but is well worth the extra effort.
As far as the parks go, in Las Vegas, we don't need permission if its a city park, but if its a county park, we would have to get a license. In the city parks as long as your class isnt over a certain number you don't need a license. Check with your local authorities for info. When you do it in parks, be courteous of the area you are using. For instance, when we used the jungle gym it was 7am in the morning, so no kids were at the park. When we used the trees with the grassy area, be knowledgeable of sprinkler times! WE got wet in one class!
Let me know if I can be of anymore help.
Hayley Hollander