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"Cooperative fundraising" is when a group's members join together (cooperatively) to raise money and then credit the funds raised (or the time spent volunteering) to the individuals who participated in raising the money (the accounts credited are known as "Individual fundraising accounts"). These types of activities, while common among booster clubs, are not considered a 501(c)(3) tax-exempt activity.
Tax-exempt 501(c)(3) organizations must be operated for a "public" purpose. Booster clubs, for example, often operate for public purposes such as supporting amateur athletics, supporting arts in the schools, community support for public education and the like. The IRS and tax court have both found that cooperative fundraising activities are operated for the private benefit of the individual members of the group involved in the fundraising. This type of cooperative fundraising may be engaged in by a for-profit, tax-paying organization, but not by a nonprofit, tax-exempt 501(c)(3) group. If cooperative fundraising comprises any significant part of your group's total activities (think more than 5% of total funds raised are credited to the individual accounts of parents/students participating in the fundraising although the IRS does not have a specific percentage test), then your group likely would not be considered to qualify for 501(c)(3) status by the IRS.
PBUSA highly recommends avoiding the use of Cooperative Fundraising or Individual Fundraising Accounts entirely. See the PBUSA IFA Policy. Other fundraising options include: