First, attend venues that attract gay guys.
Second, find a guy who you'd like to talk to. Is he attractive, or funny, or the most approachable?
Begin with a compliment, or a question, like: Where did you get those shoes...I've been looking for shoes like that.
After the answer, thank him, and introduce yourself. He may offer his own name.
If you are funny, offer some self-deprecating humor about yourself that doesn't make you sound pathetic or fishing. It may be about the topic, shoes. If he laughs, offer to buy him a drink (or a mango, or more shoes) if you're in a bar (or the produce section, or a shoe store).
Mention that drinking makes you loose and easy, but limp and sleepy. Remind him the best way to get to know you is to get you drunk, because he may relate well to the loose, easy, limp, sleepy version of you. This is a particularly good strategy if you are normally tight, combative, tense and manic. If he agrees that he'd like you in the loose and easy state, buy yourself a drink (if you're at a bar) if he has not already offered to buy your drink.
Keep reminding him that he's not getting to know the real you, and that if he's liking the new you to keep the drinks coming.
When you wake up, be careful to clean up any mess you've made (hopefully before he awakens). Order room service (if you're in a nice place), or make breakfast (if you're at your or his place). Leave it near his night-stand with a note, then leave for a brisk walk.
Talk to the old lady with the dog in the park.
When you return to the [hotel, room, flat, house] check to see if your new friend ate breakfast. If he did, it's a good sign. If not, give it to the dog in the park and learn how to cook better.