Service Level Agreement
Define the Scope of the Work - The terms constitute the body of the contract. Start off by clearly defining what it is the scope of the work or service you are to provide, and the timeline you propose to complete the work. Be specific. Don't simply say you will renovate a client's kitchen. Provide details of the cabinet designs, countertops, and other materials and work you will provide. If applicable, give a timeframe for each phase of a project.
You may want to have an attorney review and make suggestions on a template of your business contract. An attorney can pinpoint issues for your particular business that you may need to include in the agreement. You can use a business agreement template and modify it to fit your needs, rather than writing the agreement from scratch.