Talk to him like u would with ur friends. Tell him about the things u like to do and c if he likes the same things. Once u find something in common u can talk about that and it gets much easier after that. i promise.
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He will look at you, possibly smile, maybe go out of his way to talk to you or be around you.
let him know you exist through some complex and overintricate scheme to gain his favor
It could indicate that he is interested or attracted to you but may be shy or unsure how to approach you. He could also be friendly and enjoying your company without any romantic intentions. If you're interested, consider initiating a conversation to see if he responds positively.
look amazing and talk to him
talk to them, if the feeling is mutual, have at it.
no they dont
You could encourage him to come and talk to you by smiling and/or winking back, saying hi or maybe fiddling with your hair a bit.
well ofcourse they do, do u dream about the guy u fancy?
send him a email or letter
You try to make small talk something like: "Fancy meeting you here"
Try to convince yourself he's not worth it. Find someone new.
make him interested in you