Ask a friend or someone you are close to at work if they have a friend. Then all of you go out, not like a date, but just to have fun. Go to dinner, maybe play pool, go watch a game or something. Then you will be able to see how he acts not just with you but everyone. If you like his personality. Make it where you all go out a few times a week and do different things. If your not impressed see if there's someone else. Either way just be friends first, that way you don't put your feelings out there until your ready. Then if it works you have something to build from.