How do I choose a suitable domain name for my Blogger blog?

Your Blogger blog will have a subdomain of blogspot.com (e.g., myblog.blogspot.com). While you can't directly purchase a custom domain and point it to Blogger, you can use a service like Google Domains or Namecheap to purchase a domain and then configure it to redirect to your blogspot URL. This gives you a more professional-looking address.