@scabadabas12, while you probably don't want to dive into a 30 mile a day challenge like @walkamileortwo, I'm proud of you for getting started with a walking plan. Here's a simple one from Mayo Clinic to help you started: https://www.mayoclinic.org/healthy-lifestyle/fitness/in-depth/walking/art-20050972

Do you have any underlying health conditions that would be causing you to be tired?

I also work at home. It can be hard to get in enough steps or to be reminded to get up from the desk and move a bit. I have a Fitbit step tracking watch. It reminds me to get up once an hour. I find that really helps. Have you considered getting a step tracking device?