i'm really experienced with this sort of thing, so trust me on this one

okay. what i'd do is give the guy some space. texting isn't always the best way to et a guy's attention. to them, confidence is a sign that you're ready for anything, therefore they will be comfortable around you because you'll be more approachable that way. i know what you mean though- if i liked a guy i knew FOREVER and saw him again after a while, my first response would be to text him!
anyways...also, since you got his digits, give him a call and just ask if he wants to chill with you and your buddies. invite him to bring along one of his own friends. through this way, there'll be no awkwardness, and since you'll be in a group, it'll be easier to connect with everybody, including him

start off really slow- take it easy and REMEMBER- a good friendship is the basis of a really strong relationship

hope i helped, and GOOD LUCK!!!=D