All receivables, payables, deposits and correspondence must be mailed to/from the business office in the jurisdiction of incorporation.
Community service programs- check with your high school guidance counselor or business office to see if there are any summer programs in your area.
Many high schools will sell basic invitations through their business office.
Once you see one that may be suitable, stop and speak to the business office.
Local School - the business office or the principal may be able to tell you about any homeschool groups in your area.