This article will get you going in the right direction by explaining the most important skills to practice. The most important thing you can do to improve your game is to become a good athlete. The stronger and faster you are, the better you will play. Achieve this goal through conditioning and weight training. Have a physical check-up by your doctor before you start training.
Conditioning is easy.
Start with 15 minutes of continuous motion, either jogging or, even better, running full court with the ball. You do not need to move quickly. After a week or two of conditioning you will find a comfortable pace. Then, increase the time you spend in the activity according to your performance. Do this every day.