First try and observe whether or not he makes time for you. If he goes out of his way to talk to you and see you in person, then he is probably attracted to you. Notice how often he touches you, because a guy who likes you will usually find opportunities to brush your arm or let his hand linger on yours. Notice whether he introduces you to his friends and determine if his behavior changes towards you. I guess this will give you enough signs of a guy who wants to date you.