There are definitely teaching positions available, but a lot of the best ones might require that you’re here to sort them out. If you make arrangements before getting here there’s a risk of committing to something that you don’t like (school location, age or English level of students, management, etc). There are always English teaching opportunities in Chengdu for native English speakers and the certification and experience will make it even easier.
If you’re here and looking for a job teaching English, I don’t think it will take you very long to find something if you search, either private or on contract.