Or, if you're really new, it may also help to help someone else with an existing project first, to gain some experience. Join some team, maybe, tell them that you're new but that you're willing to learn. If you have a great Idea, it may a lot of work and may not be too fun if you've got to do all of that on your own. Once you've gotten some experience, people will join you as well.

Just a thought...