First impressions are formed almost automatically when two people meet for the first time.  These judgments are made quickly, based on behavior, dress, appearance, and anything that is said during the meeting.  By making a good impression, you can help increase your chances of getting a date when you ask.  First impressions can be hard to change. Looking good and dressing clean can help leave a good impression. Greet people with confidence and make eye contact to show self-assurance. Your first few words are important.  Try to say something that demonstrates your character and shows intelligence. There are many non-verbal methods that you can use to convey your interest in the person you are speaking with.  By using these in conjunction with your verbal conversation, you can help express your confidence and let the other person know that you find them interesting  Keep your shoulders back and stand up straight. Occasionally, you can tip your head to the side or nod to show interest. Smile.  As you are talking with the other person wear an easy smile.  However, smiling too much or too little can be off putting. Stand closer than you normally would to someone you aren't interested in. Make eye contact.  Avoid staring, but make enough eye contact to show self-confidence and demonstrate you are paying attention. Speak slowly and relaxed.  Don't be in a hurry when talking and leave a bit of a pause when the other person is done speaking. If you plan on going out to look for a date or are expecting to meet a new group of people, you should consider what colors you are going to wear.  Color can have an effect on people and leave a certain impression, depending on which hue you are wearing.  Make sure the colors you have on when looking for a potential date are sending the right messages.  Men who wear blue are often perceived by women as being stable and loyal. Women who wear red can appear as being passionate and powerful by men. Grey can leave the impression of neutrality and quietness, which might not be ideal...

TL;DR in Indonesian:
Buatlah kesan pertama yang baik. Gunakan bahasa tubuh yang tepat. Kenakan baju dengan warna yang tepat.