I don't use rewards, incentives, or any type of extrinsic motivators in my classroom. Yes, it is my first year teaching, and I know plenty of teachers who say they couldn't do it without stickers, candy, or special events. I really just want to say, "I do it and it works." My students are motivated by our activities, how we do them, and their accomplishments.
I really enjoyed reading @pernilleripp's post that reinforces the reasons why rewards aren't necessary. If you use rewards and/or any type of extrinsic motivator, you should definitely read her post.