Freelance tutoring work for conversational English

First - make sure your immigration status allows work.

After that, marketing is the key, starting with exploring the likely demand for your product.
Start with Google, looking for likely salaries and/or probable fees you can charge.

Are their many people who want to learn English?
How many people are doing what you do?
Then.....
Explore local schools and private businesses.

If the demand is high, but your product is rare, you'll start getting work next week.

One more thing.
Indonesia is screaming for English teachers, so the problem here is time to do the work, but a rubbish teacher will still get dumped in a very short time.
Seen that happen.

Make sure you have a course planned out for whatever groups of students you wish to aim at, and make sure the lessons aren't boring crap.