Here is a great Token Economy System that has everything laid out and ready to go. I use this in my middle school special education classroom because it deals with real money and the students all have their own wallets that they put the money in. They can earn money, lose money, as well as buy prizes and things they need for school. They can also buy device time at the end of the day. Of course homework is always free!
I usually print off 5 copies of each and put them all over my room so the students have reminders no matter where they are!