how do I close my pool step by step

Hi,
I have not filled my pool in as I was told that people want pools so much now, and if I end up selling it will be a good feature.
How do I close my pool? how much shock do I put in and how many times? I live in Winnipeg, Manitoba and our temperatures can go to -30. I do have one tree in my yard and that is it. I have a big leaf bag that goes to the bottom of the pool to get things out .Its great! much better than the flat one. Do I really need to blow out the lines? and what happens if I dont? Just for a bit of info, I put river rock and stepping stones around my pool and it looks great! Its taken me weeks to do it as the stone weighs a ton and I am a little thing.
Any information would help
Thanks
Timmie