Your thesis statement should specifically address how the author develops the idea of the struggle between chaos and order in Lord of the Flies.
First of all, you need to determine what idea you feel Golding is developing on the struggle between order and chaos. You can suggest that humans are inherently evil, or that in the struggle between good and evil it is not necessary for evil to win. Whatever idea you choose, you have to be able to support it with evidence from the book.
A thesis statement is a clear and concise description of what you are writing to prove in your essay. Let's say you will write to prove that human nature is a struggle between order and chaos. It would look something like this.
In Lord of the Flies, Golding develops the idea that human nature is the struggle between Order, represented by Piggy, and Chaos, represented by Jack.
This is just an example of how you can develop this idea, using the two characters as representing your order and chaos ideas.
For example, Piggy can represent order because he always has ideas. Piggy’s opposition to Jack is developed from the very beginning, when it says that there is no reason for Ralph to be the leader.
None of the boys could have found good reason for this; what intelligence had been shown was traceable to Piggy while the most obvious leader was Jack. (ch 1)
Jack represents chaos because he is the one who is constantly combatting Ralph and Piggy, and the one who eventually breaks the group into factions.