There are a variety of agreements that should be considered for your company's employment documents, depending on the complexity and nature of the business. Not all will apply to all businesses and some may seem unnecessary.
Every business has different processes, applicable standards and regulations, and values; therefore a proper employee handbook for your staff should not be a downloaded, unedited sample you find in the wilds of the internet.
Make sure that you are in compliance so that you do not get hit with an overtime lawsuit for FLSA violations. Learn more here from an experienced business attorney.