When you complete your sponsorship you will get a certificate for the amount of sponsorship money your group earned. Just give this certificate to your assigned printer and they'll take that amount off the cost of your order. You can order pretty much anything you want, you'll just need to print a small sponsor logo on your apparel. The printer will take care of that.
If your assigned printer is CustomInk and you are ordering online, simply hop on their live chat feature or give them a call. One of their reps will be able to add your code directly to your order for you! For any other printer, just give them a call or shoot them an email & they'll be able to help you get your order set up.
For further information on how to add your code to your CustomInk order, please see our FAQ specific to CustomInk: http://support.pearup.com/hc/en-us/articles/200547348-What-should-I-know-when-ordering-from-CustomInk-