This is where a sample template can also help. You can search for a commercial lease agreement sample for your state to help you get a good idea of what your lease agreement should look like, of what is required by law and of what you should add to your own. Make sure to find a few of good ideas to give you as many ideas as possible about how to put together this form.
When you start looking at templates you will find that there are literally dozens of them available, you may need to try several of them out until you find the one that will work best for you and all of the others who are involved in the venture. Your template should include spaces for you to clearly write down the objectives of the venture clearly so that everyone can understand and agree upon them. There should be a place that covers financial contributions and who is responsible for managing them.