Best of luck and hope you can give us an update once you are feeling up to it.
YES, please do WALK as soon as you can and as OFTEN as you can. With my first surgery [colon resection] I walked just as soon as I could get up and had no complications. A year later with my second surgery [the one you are having] I was so sick and weak going in that I did not walk as much as I should have forced myself to do. It made a huge difference in my recovery and I did develop complications with my second surgery. I may have still had the issues, but wish I had forced myself to walk the second time.