There is just one area of concern, cause I am doing Starting Strength and piling on the weights. I am doing back Squats 3x a week and now my knees are popping when i walk. Would it help to maybe go lighter twice a week and just do say 20 rep squats instead of 5 x 5 heavy weight squats? My knees just can't hack it anymore.
Yeah bro on these progressive programs you really need to start out very light. In fact so light that it seems dam near ridiculous to you. That way you have tons of room to add weight as your bod adapts to it. BTW popping in your knees is not necessarily a bad thing. If/when you have pain is when you need to consider your options.
But by all means start light and advance your weights steadily.
Good luck bro.