If you have black dots one of two things is broken
- The Video Controller is broken
- The LCD is broken
If you cant use the touch then the issue is a broken or disconnected touch panel (The touch and LCD are two separate components)
This is easily fixed for about $100. I replaced mine after a fatal fall shattered my front glass. and components.
If you are not tech savvy, call Apple they can fix it, but if your not covered by warranty then it'll cost you A LOT!