Income from 2 months as a android developer

I’m new to android development I have developed 4 games for android. As I’m new to this I’m not so sure about how to market my apps. All of my apps have low downloads. I came here because some one could help me get better downloads or techniques to get better downloads. As some of the people here are saying that they are getting 100-200 download on their 1st week. But my new is not even getting a download. Well I’m sure that my first 3 apps were flop (one of them was inspired from another game). I’m now concentrating on my new game. I wish someone on this forum could help me. Don’t Drop the Ball is my new game.