Firslty, Sir, let me tell you that I really appreciate the steps of been taken for asking legal advice before getting into the agreement.
Secondly, you all need to get to know first the exact requirement and fund that you have to be invested.
Thirdly, thereafter try to put every clause as per your own interest in the larger scale in accordance with your own requirement.
Fourhtly, there is no specific rule for that it just that it all depends upon the need of your future project.