Hi there Sadr, if you went through with this project it would be wise to use a contract, such as my contract in the stickied thread at the top of this forum. You should edit it to suit you and your project, then get a designer/coder to agree to it before doing anything. Also make sure you are working with people who are over 18 years old.

If you are scared of people doing a runner with your work, a contract will ease some of your concerns for both sides.