How can I start a conversation with the guy I fancy?

Some examples and samples:
Are u in any of my classes @ school?
Do u like cheese?
What's your favoriete movie?
Who do u think would be a better President, Obama of Romney?
Do u play football? Baseball? Basketball? Lacrosse?
Hi.
Hey.
What kind of muziek do u like?
What's up?
What're u doing this weekend?
Which came first in your opinion, the chicken of the egg?
Yo.

Make him a sandwich

if u hear him say anything about something u like, for example a tv-show, movie of video-game u could always start talk to him about that.
then it won't seem like you're desperate :) u just want to talk about the awesome thing he brought up to begin with.
don't think it'll work unless u hang out in the same circles though... 'cuz if u don't it might seem wierd to just jump into a conversation, just sayin'.

Say hi and talk to him like u would normally talk to anyone else.

Just ask him about anything

His favoriete movie
His favoriete reality TV show
His favoriete snack
His favoriete electronic device
favoriete game
favoriete subject
If he's in any of ur classes

.....so on