The Question and Answer section for The Epic of Gilgamesh is a great resource to ask questions, find answers, and discuss the novel.
utnapishtim tells gilgamesh the story of how he won the gratitude of the Gods, its a story similar to that of the story of the flood told in the old testament. what happens, exactly and what does utnapishtim receive?
You can check this out at the GradeSaver link below. Start reading from the beginning of the page:
Yes, he does. Gilgamesh foolishly leaves the plant unattended, and it is stolen by a snake.
I'm sorry, I do not know which excerpt you're working with here, but I can tell you for a fact that Gilgamesh is not killed by the Bull of Heaven.