"Cable connecting the logic board to the display screen ripped/torn." için yanıtYou will need to replace the digitizer unfortunately there is no way to reconnect it once it's torn.
"Will the iPhone 4S camera module work in an iPhone 4?" için yanıtI'm not sure how it's possible for your 4s camera module to work in your 4 when there are a difference in conn pin count.
"Do I need the little round plastic piece around the camera?" için yanıtAbsolutely yes, otherwise it won't focus properly.