Hi
I'll reward my boy with stickers each time he completes writing his English word or Chinese Character.
He will paste the sticker that he has "earn" on the learning chart that we have drawn up together. When he completes the chart, we give him another little surprise(book/transportation stickers/toys)
Generally, I'll do the writing practice on a regular basis but keep to short words(hot air balloon/happy birthday)
Hope this helps.
Will be updating the learning chart on my blog soon, you can see it at
http://www.remembering-moments.blogspot.com