Be sure that your thesis expresses one main idea, even if it is backed up by other ideas. If you give two or more ideas equal spotlight in your thesis statement or introduction, the reader won't know which is the point you are trying to prove, and which are supporting points. A thesis such as "Children love bananas, which contain a lot of sugar but are good for you," is confusing: Are you trying to prove that children love bananas, or that bananas are sweet, but good for you? Rewrite the thesis: "Children think they love bananas because bananas are sweet, but really it's because bananas supply essential nutrients such as potassium."
You won't have much to write about if your topic already has a general consensus. Rather, to make writing your paper worthwhile and to keep it interesting, articulate your thesis so that it reveals the controversy you are attempting to sort out. Don't write, "Bicycle projects are a fun place for women to learn to fix bikes independently," because this is just a statement of opinion. Rather, stir up some passions: "Though a history of male-dominated bike project spaces has made it difficult for women to feel comfortable in these spaces, setting boundaries and articulating priorities create a bike project space in which women have a positive experience." This latter thesis shows that there is also an argument against bike projects being a fun place for women.
Taking a stance in your thesis articulation will clue readers in to the point you are trying to make, and give essential force to your central theory. "Some people think time management works for everyone, while others say its effectiveness depends on the individual," should become, "Time management, while highly touted as an effective work habit for anyone, is only effective for those who think in a linear fashion."
After you articulate your initial thesis, use the "So what?" test to see if your thesis is strong enough to merit research and a paper, and if you are expressing enough information to get the reader interested. If a reader's first response to your thesis is "So what?" you need to make your thesis more specific and relevant. For example, "People drive their cars every day," is a weak statement, because a reader might respond "Yeah, I know. So what?" Flesh the thesis out: "People drive their cars every day, in spite of increasing greenhouse gasses on the planet, because they don't feel safe using other forms of transportation."
Using a question for your thesis cannot articulate your stance, since the reader doesn't know how you would answer it. If you are focused on a question for your thesis, think about how you would answer that question, and make that answer your thesis instead. "Is it possible to create a family from those you are not technically related to?" may be a compelling question, but a better thesis will read, "Although there are strong societal expectations that true families are blood related, many groups of people who are not blood related function exactly as blood related families do."