Answer:
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.
Long and think, red within, with a nail at the end.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?