What qualifications do you need?
Being a clown depends more on your character than what qualifications you have. Of course, things that you have learnt can serve as a backup for your work. For example, sometimes you have to speak English to communicate with people.
What sort of person does the job suit?
You must be a jolly, positive and patient person. The job of a clown is to bring happiness to people, and you cannot do so if you are a negative person. You also need to think quickly and have the ability to respond to different kinds of situation.
What's the best way into the industry?
You have to enrol in some training courses. The Professional Clowns' Club will sometimes offer such courses. I know that Ocean Park has offered some professional training for clowns over the past few years. You can also keep an eye out for classes run by community centres.