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Freelance proofreaders will correct all spelling and grammatical errors in your text. You may also arrange to have your proofreader make the actual changes (which is easier if the copy is online or on disk). If you go this route, it's a good idea to have your proofreader send the original copy as well as the corrections to you so you can compare.
A very good proofreader will also act as an editor, reworking sentences to improve their content and flow. However, this is not a typical part of the job. So let your proofreader know what you expect the scope of his or her duties to be.