I agree that checking with your doctor and going to PT would be a good start.
Besides that, I think you might like the Spark 28 day bootcamp challenge. You can find it by clicking "Community" then "Challenge Central". With this challenge, you will have a different 10 minute ST video to do every day. That should get you started with strength training.
I also have to stress that using 3 pound weights is probably not going to help you get stronger. I bet you carry much heavier stuff than that during every day life - laundry basket, grocery bags, pets, kids -- all weigh 10+ pounds at least. I think you need to do body weight exercises or invest in some more equipment like more weights or resistance bands.
You don't have to eat the whole thing.