@ehuntington Find one spot on your body where you are (or at least feel) strong. To start, we just want to be careful to reduce injury. While elevating the heart rate.
Someone said walking. ABSOLUTELY WALK. When your feet or joints get tired, find a spot on the couch where maybe you can work your arms. Controlled, lightweight reps (fast as you can but again, DONT RISK INJURY) will again elevate the heart rate.
Once you find that you can get your heart rate elevated for an extended period the goal is to find some stairs. Or a hill.
This is not a sprint. Stay healthy so you can continue the journey. The goal is to climb stairs or a hill without being completely gassed. When you start to notice yourself handling this easier, your progress is right in front of your face.
Find a routine, and crush it. Once your routine is crushed, add a smidgen more difficulty.
I could go on, but I'll end with diet.
This is my struggle.
You will find all of this comes together fast(est) if you commit to both. I mean I've seen the weight literally fall off when committed to both. I've seen ok results when only committed to one or the other. Ditch the soda and snacks. Be hungry. Train your brain to use it as motivation. Hunger pangs? Drink a glass of ice cold water. Do not starve yourself though!!
Steady is the course. Best of luck.