Well, (smiling) - first off I would say to just try to be his friend and talk to him as you would any one else, the best marriages started out in friendship.
Then I would suggest that you not play any guessing games, let him know that you are interested in the relationship growing into something else - do this either through a mutual friend or by asking him out for coffee and some good conversation.
Touching his arm or hand is a good sign that you are interested.... try IT some times.

LoVe,
Rhapsody -