First, you need a name. Then, post banners and flyers all around the local playgrounds and courts, letting people get your message. Have practices and tryouts, getting a basic feel of everyone on the court. Then, once you have your team, then you can make headbands, t-shirts, etc. But first, you gotta have the team. Websites are also crucial, but worry about that after you got your team, or it's in the making.

-Sqez