Answer to: pressure contact and extra part after battery repairThat's not so important foam from your camera. Doesnt matter, just trow it away.
Answer to: Screen Cracked can not see anything every thing is black .I think the best solution for you is bring your phone to that repair shop that has the experience to fix it. Tough the repair is not that hard to do it yourself, you might have a better chance with the shop. The reason wy you're screen is black, because the LCD is damaged, normally when replacing the LCD and touchscreen, youre phone should work just normal again.