There are two main putting styles, straight armed and bent armed, try them both and see which one you feel more confident with
Maintain a constant posture throughout the entire swing so that your body does not move towards the ball during the swing and cause the heel of the club to make contact with the ball
Although you might not know it you have the ability to control the distance on each of your clubs, use the numbers game to figure out how long you should make your backswing to hit each club whatever distance you want