I know you probably get nervous before you want to say hi to a guy on the internet. It’s just that feeling you have for a crush. I’ve felt it too. But if you really want to talk to him then you just have to get over your fears because you like him. So after he’s online for 5 minutes instant message him. You don’t want to seem too desperate. If he’s been online for only like 30 seconds, it might seem weird to just be like “HIIII” right away.
So when you build up your courage just say “hey whats up”. Most guys will respond back and if not they’re jerks and not worth your time. If your feeling even a bit more risky and you’ve talked to the guy a lot before then you can say “hey cutie” or “hey handsome”. Guys love that because it lets them know that they are wanted or that someone out there thinks they are cute. After you’ve said hi, make sure you keep the conversation going. It could be awkward if you just say “hey whats up” and then “nothing much” after he replies. Find things to talk about.
Tell him something interesting/funny about your day or your plans for the night. Even try to ask him to do something. Talk about your interests and he’ll start telling his and then you’ll know more about each other. If the guy is super cool he’ll be the one trying to keep the conversation going not you. Trust me you’ll notice it after a while depending on what they say.