here are some tips i have found in numerous places, videos, books, etc. and some from experience.

1: smile
you have to smile. its tells the guys that youre interested and tu want to talk to him

2: make eye-contact
eye-contact is very important. like #1, it tells him youre interested

3: ask him advice
guys amor it when tu ask them consejos and confide in them. they amor that tu value their opinion

4: touch your neck, lips, ear, etc.
while youre talkin to him tu should touch your neck o tu lips o ear o somethin (dont ask me why, i found this in a video XD. but if u understand why, good for you!)...