First off, welcome and big congrats on making the decision to do this - and do it right. When I started going Primal/Low-carb last spring, I had about 55lb to lose (still have 10-12 to go, I've been treading water lately). I too was inspired by the Carb Curve and resolved to get below 100g per day. To do that, I tracked my food intake at sparkpeople for a couple of weeks while eating normally, no Primal meals yet. I wanted to see the carb/fat/protein balance of my regular diet. After 14 days or so, I had enough information to know what to cut out and what to boost. I immediately dropped all wheat, added sugar and all fruits.
For the fitness part, I did no exercise the first month except for some walking at a normal pace for 20 mins a day. IMO, people who try to fix their diet AND start a new workout plan at the same time are setting themselves up to fail. Get the food part sorted out first (follow the 80/20 rule - weight loss is 80% diet, 20% exercise). Once you've lost 10-15lb from eating right, you can work in some exercise. I do HIIT, a little lifting, and walking. There are low impact HIIT routines that aren't very hard on joints, if that's an issue for you.
Good luck in your Primal quest! You're in the right place.
2011 - The year I went Primal
Start weight: 198 / Waist: 32"
CW: 158.5 / Waist: 28"
Supplements: Calcium and O-3 in AM. Natural Calm, Valerian Root Extract and sublingual Melatonin in PM (for lifelong chronic insomnia).