First of all, if your main interest is in starting a group in which you may discuss physics with other interested parties, Inot making a "high school physics club". This will do several bad things, such as exclude most or all people except students at your own high school. It will also confine activities to whatever is being taught in science classes already, instead of promoting independant study for it's own sake. Much better would be to form a group outside of school, and then invite any freinds who might be interested. Maybe put up a sign promoting the club with a url to a website that explains it, and has an email adress and/or internet forum for people to send further questions. It might be a good idea to choose either a public space or a property you own for getherings, or even just a resteraunt. Try to choose somewhere unpopular, if you go with a public space, so you won't have to worry about interferance too much. And don't obsess over administration or other things that groups of intelectuals shouldn't need. The idea is to gather a group of equals, not a group of underlings. As for projects, you can get some ideas from here, but try to think up some things for yourselves:
http:?
www.scitoys.com/
http:/www.instrucables.com/
http://amasci.com/