First, sign up at canva.com through Google (your school account)
This will bring you to the Beginner's Challenge. Once you have completed the Beginner's Challenge, try these other tutorials:
Once you've got the hang of those, click the Canva logo at the top left to return to main page and click Create a design. Then choose Business Card.
Now design a business card that represents you! Be sure to include:
A front and back design. Click +Add a new page at the bottom to add a second canvas for the other side.
Your name and a creative title for yourself: Cat Lover, Math Lover, Slime Queen, Future Neuroscientist, etc...