initial to start conversations

imagine you noticed a guy in soclial event who is really cute...first start with eye contacts,give casual eye contacts...then if you find him sneaking glances at a little...if he is interested in you he,ll surely smile back...
then when he seems to be around close by...if he looks at you and smiles,then you can start a conversation safely,For ex:"whic college?"...or if you dunno his name "whats your name"...dont be surprised if he asks your number!
hope this tip helps