how will knowing that Romeo and Juliet kill themselves before the story actually begins affect your reading of the play
well you need to read through it there are more deaths throughout the play that lead up to the death of romeo and Juliet.
It makes you feel a bit awkward, because you feel connected to the characters as you are reading, and when you know that they both die in the end, it makes you feel a little sad, because you know that it isn't necessarily going to end up happily ever after.
Hope this helps!
~Mistermistyeyed.