How can i get into contact with a guy i like? Note: there are some guys on the course who possibly know him.?

I've been single for a while and recently i met this guy who i think is amazing and i really like but i'm not sure what i should do. In the past i've been cynical about relationships but this guy has made me see them in a more optimistic way, the course i'm on is only a few weeks and he was only there for the first week and we had a spark but i'm not sure what to do or how i should contact him?