How do i talk to him? Watch
Just start off with something as benign as "it's pretty packed in here tonight, ain't it?" or something like that. If you've seen him a few times you could make a joke about it, say (jokingly) that you only go there to see him.
You could just make small talk and observe how he responds. Build up a repoir so that it becomes easier to talk without embarassment or uneasiness. Then you could pop the question...unless he pops it first.
Just say hi, and let it go from there
because i do sort of know him but havent really spoke to him one to one if that makes sense
I don't know, just say hi and ask him how he is. If you make a bit of effort, I'm sure it would be appreciated rather than just not talk to him at all or make no real conversational effort. It wouldn't seem too desperate if you play it cool. You can't really like someone properly without getting to know them yourself though.