How can I start my essay?
It is a good idea to start with an outline. You will also want to come up with a Thesis Statement. That statement will list what you will address in the Body Paragraphs. Once you have settled on two or three things to address in your Body Paragraphs, the paper will be easier to write.
What's the difference between "watched" and "saw"?
The differences have to do with your intention. When you "see" something, it comes into your sight, but you weren't really looking for it. When you "watch" something, you look at it carefully, and it is usually moving.
What's the difference between alliteration and onomatopoeia?
Onomatopoeia is the sound something makes, like "Buzz" or "Crunch". Alliteration is the when the same letter or sound is used at the beginning of words in a sentence like "Peter Piper picked a peck of pickled peppers."