Im really confused with obidience stuff.

How old does your puppy need to be to enter? Elvis is getting older, and Im pretty sure he is around 4 months old.

and the number one thing Im really lost on is where do I start? We don't have any dog schools here close to me (not that im sure of) and I don't know where to look. This is the first time we are doing this. so, any help I can get, is appreciated.