While it is possible to meet gay men at any old bar, you'll have more luck if you go to a gay bar. Not every guy in the place will be gay, but the numbers are in your favor. Don't feel obligated to stick to gay bars. If you want to go to a bunch of different clubs in an evening, feel free to do so. The world is a more progressive place, but be careful. Some guys may not appreciate if you question their sexuality. You might have to approach a lot of men to get a response. If you want to meet guys, you have to put yourself out there.  You don't have to approach a man every time you go out. Make sure you're in the mood to flirt and be flirted with. Don't hit on every single guy you find attractive. You'll come across as disingenuous, and it may hurt your chances of meeting someone. Start with a simple "hello," or even a smile. Using a pick up line is bound to get you ignored, or worse, laughed at. This doesn't mean cracking jokes or spouting off a witty one-liner is out of the question. Quite the contrary: if it's original and you're saying it honestly, go for it. Once you've approached your guy, just start talking. Try to let the conversation happen flow naturally and just keep it simple. Don't try too hard to seduce him. Don't play games. If you like the guy you're talking to, then let him know you're into him. If you're dancing at a club, talk about other places you like to go dancing. Invite him along. Keep the conversation fun and easy. While it's good to ask questions, don't interrogate him. Let the conversation happen naturally.

TL;DR in Indonesian:
Pergilah ke tempat Anda bisa menemukan pria gay. Dekati pria yang membuat Anda tertarik. Jangan mulai dengan rayuan. Jadilah bersahabat. Berbicara mengenai kegiatan yang kalian berdua suka.