I think sticker charts are a great idea. Marisa LOVES stickers and I am in the process of creating a nice chart for her where she gets stickers each night for doing a certain task that day (starting small with one thing, for example I am going to start with no yelling at Elijah for the day) and then once she has so many stickers, she gets a bigger treat. I will put one sticker on her chart (high up so she can't reach it) and one sticker for her hand, as she loves that. And then it will slowly be harder to get, e.g. she needs more stickers or she needs to do two things that day... so pick your biggest battle and tackle it perhaps with a chart!