If you don’t want to engage an attorney, there are “do it yourself will kits” available on-line. Make sure they are valid in your location.
Having a will is a good idea, unless you have very little or just don’t care. Between the Mortgage bank, creditors, and people who make claims against your assets, your worldly possessions may not go where you want. In the US, the courts usually assign a lawyer to manage the assets (in “surrogate” court) and determine where they should go. In many cases the state takes what is left into their general fund – if there are no heirs or claims against the estate.