A thesis statement should include the topic of your essay as well as a preview of the major supporting ideas. The supporting ideas are the topics of each of your body paragraphs. You would write a draft of your thesis statement at the beginning of your outline, so it would be easier to complete an outline of your ideas. A clear thesis statement about cell phones in school might be: Cell phones should be allowed in the classroom because they can be a useful tool for education, a necessary way of contacting someone in an emergency, and an importance practice in ignoring distractions. This statement gives the author's position on the topic of cell phones in school and then lists the supporting reasons in the order they should appear in the body paragraphs.
The given clause "when the water boils" is an example of a subordinate clause. It is a subordinate clause because it begins with the subordinate conjunction "when". The next clause which is "[You] add the eggs" is the independent clause.
