Your new domain is going to be your branded business name. You need to ensure that future social media profiles are available. Use Knowem.com to quickly check profile availability for your new brand and instantly reserve handles from services like Twitter, Facebook, Instagram, Pinterest, and others. It’s probably not a good idea to buy a brandable domain if its corresponding social profiles that are already taken.
A domain name is how your website will be known online, no matter what type of website you’ll have. It is the unique address of your site on the internet and it will be yours as long as you continue paying the annual fee ($10 – $15 for the .com domain). Users who know your domain technically referred to as a URL (uniform resource locator) can simply type it in their browser’s address bar, and be taken there. Others will be able to discover your blog through search engines such as Google and Bing.
If you are marketing yourself, ideally you'll be able to use your first and last names (johnsmith.com or janesmith.com). Even if you aren't marketing yourself, it's not a bad idea to register your name as a domain now, in case you want to use it in the future. If you are marketing your business, you should see if your business name (yourbusiness.com) is available.