a hook? start with an easy hook question sentence, then try to go on from there. those always get the reader or have you start with something and began to answer your question in an intriguing way while following up w/ paragraphs. Ex. "Why is it a good idea to keep a certain amount of bags out on the curb? for the majority of the idea, we want this idea to help stop a state of pollution or bags flying around and being caught elsewhere than garbage disposal ." blah blah.
The theme for this story could be that if you work hard enough, you can leave your troubles and problems behind. The theme could also be that if you try too hard to avoid danger , than you might put yourself in more of it.
