How can i flirt with someone if the guy knows i like him?

and how can i get him to flirt back. Also how can i aproach him. and also how can i get to think i'm not weird and have him talk back!! I am totally not born with the whole flirting part when i like them but when i'm with my brothers friends it is so easy............HELPHow can i flirt with someone if the guy knows i like him?
Okay when i know a girl likes me, what works best is when i am talking to her and asking her questions, like what are you up to? Oh just thinking about somone, but never mentining him... flirting while playing hard to get will drive him crazy.How can i flirt with someone if the guy knows i like him?
If the guy knows you like him what's the point of flirting anymore, thats used to get the guy's attention you already have his attention now its time to make a move. You're the shy type so find whatever strength you have and use that to work your way into his arms. Find something that interest you and him both.
Just start getting into the stuff he's into and don't make obvious flirting.
Just walk up to him and say these two words, all ur problems will be sloved - ';ROOT ME'; good luck....u need it!