@irfan do you have a fishmonger nearby at a pasar? I usually do ikan bawal (black one) but white is also fine
Ask them to clean it for you
When you get home, put salt on both sides, steam for about 10 min (for small fish), 12 min for medium fish. It’s done when the flesh is flaky when you use chopsticks to poke or pull.
You can add any condiment you want (kicap or sambal) after steaming