Hi Mike,
I'm a rookie myself. I only have 22 days on my back, and i can honestly say putting has been my biggest challenge so far also. The only way to get better is a lot of practice. You can also upgrade you putter, but it will not help much before you learn how to control speed and learn how to read the green. Also be aware of the green speed:)
I also recommend to join a Country Club (or CC witch they call it in here). It may help you to learn and improve your game faster.
Good luck with you Golfing:)