The order of items above is the best order to present each part of the introduction: get the reader's attention, move toward the thesis statement, and then present the thesis statement. The thesis statement usually is most effective as just one sentence at the end of the introduction, so you should avoid presenting the thesis statement as the first sentence of the introduction and should avoid presenting the thesis statement in more than one sentence. (Information about thesis statements is presented on The Thesis Statement Web page.)
Many people find it useful to write their introduction after they have written their assignment. They find that it is through the process of writing their assignment that they clarify the overall point they wish to make in addressing the set topic. They then draft their introduction at the end, or they return to their initial attempt and re-write it. Refer to What does a good conclusion look like? for an example of this. Of course, some people prefer to start with an introduction that helps guide their writing. Either way, it is still good practice to ensure your introduction says what you want it to say!