Well, if your pool is an in-ground, then you'll want to follow this page Pool School - Closing an In Ground Pool. This will tell you what to do to protect your lines and equipment. Unfortunately though, a green pool now means a worse pool in the spring. Do you plan on attempting to clear the green before you close? If so, you'll need some time to complete a SLAM via Pool School - SLAM - Shock Level And Maintain. If done properly, it may take a few days, or may take a week or two depending upon how bad your water is. I know you're racing the clock with the weather, but there's just no magic formula to clear the green. Just good old-fashioned bleach, patience, and consistency. Let us know if you have any other questions.

If he is getting a new liner anyway, the pool will have to be drained...so, I would say drain it down and let it go. Pump it out in the spring and replace the liner, start from new.