There are also a few standard legal provisions you should include, such as a statement that you and the client are not partners in business and that you and the client have no outside agreements about the deal except what's been included in the contract. You can find language for all of these provisions (and many more) in Consultant and Independent Contractor Agreements and Working for Yourself: Law & Taxes for Independent Contractors, Freelancers & Consultants, both written by Stephen Fishman and published by Nolo.