Not clear if you are trying to get credit for something you previously did or are considering volunteering as a benefit in applying for a NOM. If something you did previously, like volunteer on a campaign while in high school, I would assume you were one of many doing entry level/basic tasks for the campaign. Doubt they would be worth putting on your resume. Volunteering at the MOC can back-fire if you come across to those you interact with as doing this simply to gain 'points' on your NOM application. MOC's typically delegate the NOM process to a committee of individuals you may never see before the interviews take place. Have to ask yourself would you have considered volunteering at the MOC's office if you were NOT applying to an SA?
Getting a NOM is not about being politically connected or who you know. For example, your parents donating to a particular politician likely will have no bearing on who gets a NOM.