There are lots of companies that sell website addresses (AKA domains or URL). Here are some basic guidelines for you to use for your website address.
Keep to less than 15 characters if possible
Make it memorable!
Do not use acronyms as that is tough for people to remember!
Use dashes to separate words if necessary.
Base it on your business or product name.
There are lots of different extensions now (examples: .com .net .us .info .org .edu .io .store etc.). Choose one that is relevant to your business. Do not use .org if you are not a non-profit and do not use .edu if you are not an educational establishment. To use .us you have to be a USA based business!
Here are some websites that sell website addresses!