You can make a will on your own (you can find DIY kits for making a will online or in stationers), or get help from an expert such as a solicitor. Many charities also offer will-making services in return for a small donation or legacy. It's usually best to get legal and financial advice when making a will so that you know that it will be valid and accurately reflect the value of your property, finances and possessions.
Once you have made your will, you should remember to keep it up to date if your circumstances change - for example if you sell your home, get married or divorced, or have a new child or grandchild whom you would like to benefit from your will.