How can I get my dog to stop his barking habits?

I have a male yellow lab who is almost 3. Since he was a puppy, he's always had an issue with barking too much. Most times if we let him outside, he will do his business then come right to the door and start barking to come in. If I'm outside doing something other then playing with him he will constantly bark until I throw him the ball and if I don't pick the ball up within seconds of him bringing it back to me, the barking will get worse. My husband, neighbors and myself are getting very frustrated with this situation. Any suggestions on training advice to stop this habbit would be very helpful!! Thanks in advance!