If you have any type of education background, formal or informal, and a Bachelor's degree, you can teach English to Chinese kids on VIPKid. You don't have to be a former classroom teacher, you can have experience being a tutor or any number of less formal educational roles. The key is a comfort with teaching and when the students are kids in China, it's not as intimidating as you think.
A word of caution: Remember that where very little is required, very little is offered. These jobs don’t pay much, and they are not going to provide a reference for your resume. It may take working at several different of these online jobs to pull in the income you want. And as always, know the signs of a work-at-home scam as you sort through the opportunities.