VC Lab has developed a free Venture Share Agreement that is designed to be used by venture capital firms and Venture Partners alike to quickly start working together. The template agreement is designed to specify the duties and compensation of a Venture Partner by checking boxes. All the details can be found here: https://govclab.com/venture-share/
IMPORTANT: All conversations about VP compensation should be high level over a call. Do not put anything in writing until after you have formed and performed a 1st close. These agreements are between the VP and the fund, so none of this can take place until the fund is operational.