You inspire me with all this walking.
I used to walk for an hour about 6 days a week. I injured my foot, and I just can't get back into the swing of things now that it is better.
Just start out slow, Walk 1 block the first day, then add a driveway each day or walk for 20 minutes then add to it each day. I found it very helpful to find a friend to walk with, then you have someone to keep you moving. If you don't have someone to walk with you, pop in a podcast and let Pete & Crew keep you entertained while you walk.
We started out walking for 20 minutes 3 weeks ago and now we walk for an hour, every morning. We meet at work at 6 am and start out from there. It is so much cooler in the morning than later in the day, which helps keep us going.