These webpages on thesis statements should help you write a good one.

Question

http://leo.stcloudstate.edu/acadwrite/thesistatement.html

http://owl.english.purdue.edu/handouts/general/gl_thesis.html

http://grammar.ccc.commnet.edu/grammar/composition/thesis.htm

http://nutsandbolts.washcoll.edu/beginning.html
Scroll down a bit to find Thesis Statements

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Would this work for a thesis on a compare contrast essay?

Lady Macbeth and Ophelia both compare and contrast with their viewpoints and personalities.

Summer, please check out the post I just put up to your question. The above thesis is too vague, non specific. One characteristic you might look at is that Lady Macbeth is a very controlling lady; whereas, Ophelia is very easily led. Look at those sites I gave you for further ideas.

Thank you!