Investigate the requirements for wills in your state. Although some states have subscribed to the Uniform Probate Code, which harmonizes the laws on wills across participating states, as of November 2010, most states have not. Determine the number of witnesses you need, the age requirements for writing a will, and whether there are any requirements as to content. State laws on wills can often be found on the state's court service website.
Write a list of all the assets you wish to leave to your beneficiaries. List assets such as your house, money and any prized possessions. Note down which person is to receive each asset -- or a share in each asset -- by writing his name beside the item in question. This makes it easier to write the will and ensures you do not accidentally leave anything out. Review the list and make any changes as necessary.
Choose who will act as your executor and name her on your list. The executor is the person responsible for carrying out your wishes as laid down in your will, so she must be reliable. She is free to refuse the job, or may be unable to carry out her duties when the time comes, so it is a good idea to also choose an alternate executor you know will be comfortable undertaking the role. Check that the person or persons you chose are legally allowed to act as executor under your state's laws.
Write the will. Ensure that the structure and presentation of your will reflects all state requirements as to content or format. Some states require typed wills and will not accept handwritten wills, also known as holographic wills. Sign the will before as many witnesses as your state requires. Have your witnesses also sign the will.