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.
As you begin to consider putting together a joint venture, you need to sit down together and consider all the different eventualities that can occur. You need to establish your goals and mission statement and put them down in writing. You will also need to list the responsibilities of each of the members of the venture as well so that there can be no mistake in who is responsible for every facet of the day to day operations, at the same time should anything go wrong it can help decide on whose shoulders any blame may fall.