My Perspective, feel free to use:

1. Yes and No

Yes - If i know that he is single
No - He is not single and is my friend/ best friend's boyfriend

(U can find out from asking around, use your info gathering skill)

2. NEVER NEVER NEVER tell a guy that you like him, even though that you really really do and that u get chill everytime u see him. Being friend with someone is easy if your mind is clear, if you cant keep your mind clear, then do this:

Find a right time and make use of relevant topic and start a conversation, following is an example of a situation:

Take note: Right time = Anytime

You saw that the guy u like is lining up for movie ticket, find a way to get behind him (there are many ways, but you would have to figure it out yourself), you saw that on his jacket it has a logo saying "westcoast chopper", then start a conversation by commenting on that, "wow..  i dont even know a single ppl in malaysia know of this club <point on the logo on his jacket>" or "ohh..  i am a fan of the New York Yankee as well as u saw he wear a NY Cap" If he response with awareness of the club/team, then you are screw (only if u know nothing of them), but if you are calm then u are not (answer vaguely but mean it, the first question he asked related to the club or team) and then.... this is when changing topic is smart, move on to "which movie are you watching?" "ohh really...  i will be watching that movie too" "are u here with friends?" "ohh....  me too...  all my friends are busy (even they have put you in charge of getting the ticket for the movie you all agree to watch)" if he responses...  "would u like to watch together?" then...  you did it...  u open the door to first step...  also.. this way you could know that this guy is gentleman as he offers to watch it with you instead of you asking if he wanted to watch with you since that u both are alone. Meaning...  this guy worth your time persuing further...

3. Dont judge yourself, everyone come to this world with a unique gift, U have to look at your goodness instead of the badness to boost your self-esteem up. The best thing to do in the begining of any relationship is to keep thing simple, dont judge yourself, and dont judge the other, think positive and most importantly...  BE YOURSELF ... 

Formula:

Be friends + Know each other + if that is what you want + go further more!!!