Take time to plan out your character. Start a planning page. Think about what attributes (eg: hair, facial features, accessories, clothing....) you want them to have. Sketch out a concept.
Download a copy of the template. Use it to create your Digital Version in Affinity (Use Vector for large chunks block colour/design and use Pixel for hand drawn details)
This tutorial covers how to make a Paperbox character, but also covers the basics of Illustrator tools. Great if you need a refresh!
This needs to be updated to Affinity (but ironically, tutorial tools still relevant!)
Use the 'Attach' option so your teacher can print it out for you. Once that has been done, construct your final Paperbox Character!