Are you using the Class Dojo website for behavior management? Or are you thinking about using it, but don't know how to reinforce those points?
Here's a simple way for kids to keep track of their own points and then trade them in for classroom privileges. These rewards won't cost you a fortune - kids can earn a chance to sit by a friend or be first in the recess line. You will have 18 different reward tickets ready for your class, plus a blank page of tickets for you to create your own rewards.