It is advisable to buy a custom domain like myexploringlife.com (yourdomain.com). Although it is not the rule but it helps, in making your website look more professional and also shows your seriousness towards profession. It is also advisable that your website should have domain specific email like [email protected]

Now a days domain name with email address can be purchased at a very low, affordable prices from the websites like Godaddy.com, Namecheap.com, Hostwinds.com etc.

Note: For Google AdSense you should always apply with root domain like yourdomain.com not with subdomain like blog.yourdomain.com.