Find The Right People
Organizing your own community garden can seem overwhelming at first, so it's important to have a group of likeminded people around you that are interested in the idea and have the same passion that you do. Whether you decide to use a site like Meetup to get a group together or you have a variety of friends and neighbors who are already excited about it, ensure your group has gardening and planning skills to bring to the table.
Research The Community
There's a good chance that you'll want to choose a gardening site that's not too far from your home, so talk to local horticultural organizations and your city or community center for information on available areas of land. Once you know the details, it will be easier to determine what exactly you want to do to fund your garden, whether you want to pay into it on your own or you want to create a sponsored society so the costs are covered. There may even be loan programs in your center that are available for your project, so ensure you ask around.