Hey there! I don't have any expert advice, but I think squats would be great for you (anyone actually!). Can you get into a squat position comfortably using just your body weight? That would be with feet flat and hips down to parallel, at least. Do you have the primal blueprint fitness handbook? Mark has many videos showing proper form and the progression to get there. Once you're doing well with just your body weight then you can consider adding a barbell. Hope this helps!!