Generally you will receive button making supplies with stickers on the back, pointing to the #RULbuttonmaking. If you need to make your own stickers, please use Avery labels to print the following file.
If you Google 2.25 inch button templates you will find multiple options. What type of template one uses depends on how technologically savy the button maker is. See a few options at the following link. The traditional template we send out to students is located on the right hand side of this page.
U Make Buttons (templates for Photoshop, Illustrator, jpeg, PDF, Word doc, Corel Draw)
Your best bet when it come to printing images is to use standard printer paper. Heavier weight papers can encourage the machine to jam. It is recommend that if you are using paper other standard printer paper, you test before printing out all your images.