There are many such as the cooking scene in the movie where the Cullens (apart from Edward) are cooking for Bella. This part is not in the book. Also, where the bad Vampires (James, Laurent and Victoria) are "Feeding", (In the boathouse and factory). Those two parts in the movie are not in the book. Also, near the end of the movie, where she has to get away from Alice and Jasper, the part in the movie is slightly different.
The twilight movie uses most diolouge from the book and is basicly the same except for some small differences.
Twilight is a movie becasue it helps readers understand and picture what they have read in the book.
Yes. New Moon is the next movie/book after Twilight
The book was based on a dream, and the movie was based on the book, so yes, the book and movie were based on one dream of Stephanie Meyers.
If you mean that the director better make the movies exactly like the book, then good luck. They always try to make the movie better than the book but they usually dont. the book is always better. For example Twilight the book and Twilight the movie are totally different.