Work from the ground up and make sure everything is aligned square to the target line and that your eyes are directly over the ball. Decide which style of putter you are (in-square-closed) or back and through the line and work on it. No short cuts to being a good putter other than sound technique and loads of practice.
A good putting aid could also help especialy the V-something or other available soon from all good golf stores and some others too
A good putting aid could also help especialy the V-something or other available soon from all good golf stores and some others too