How can I start a Mock Trial Club in a small high school?

I've always been really interested in law, the constitution, and arguing, but I always thought that I wasn't the type to be lawyer -- until I read "To Kill A Mockingbird" by Harper Lee three years ago, back in junior high. I'm now a sopre in a small high school in California. We had a Mock Trial Club once, but I don't know what happened to it. My guess would be that, as was the fate of most obscure clubs started on campus, it fizzled out due to lack of participation from the student body. That was before I started here. I'd really like to resurrect it, and I have support from the majority of my friends of all grade levels. My only problem is that clubs at my school are basically student run, with little to no involvement from staff and faculty such as teachers and the principal. I have no idea what being the president of a Mock Trial Club entails; I know we wouldn't have access to any real lawyers, judges, etc., but I was hoping that it would just be fun and casual. How would I go about starting and maintaining a Mock Trial Club? Would I have to prepare the cases? And how exactly do they work? Thank you so much for any insight! This means a lot to me.