Sounds to me like you had a good experience the first time. You might want to bring along some water or another drink that you like (Lemon Lime Gatorade= fucking rocks) that you can sip on so you won't feel so dehydrated. That was pretty much what a normal high feels like, though your first 3 times or so are the best of all, so enjoy them while you can. You coughed because you were smoking weed. You'll get to where you can hit the pipe as much as you want and you won't really cough all that much. Welcome to the "Fraternity of the Leaf"!