The exercise you are going to do sounds doable but I would try to do a couple of aquarobics classes every week rather than the weights sessions. It is much softer on your body and, in my opinion, much more fun. I have been doing aquarobics for 13 years. I had to give up a very enjoyable self defence class, which I had been doing for two years, when I was into my I.V. chemo. after being diagnosed with mets in my bones, spine, neck and liver. I have to avoid contact sports. I was just about to start doing my belts.
Walking of course is the essential exercise.
I also do at least three yoga sessions per week. My son and daughter-in-law gave me a year's membership to the yoga studio for my birthday.
Just listen to your body.