Get a .com extension if available. Web users expect web sites to be a
.com in the US and will usually enter your domain as .com
Keep the name simple and easy to remember. Also make the name easy to
associate with your site subject. Don't get cute or cryptic.
MyShoeStore.com is better than MSS.com
Did you decide on your sites keyword phrase discussed on the content
page? Search engines use the domain name to help identify
the site contents so use your keyword phrase in the domain name. For
example this sites keyword phrase is "my own web site" and
the domain name contains "makemyownwebsite". As an
alternate use "-" as in "make-my-own-web-site".
Consider registering similar domain names or multiple ending
extensions (.com, .org, .net) For example a non-profit web site we
manage registered both .com and .org. Most visitor use the .com but
some know it is a non-profit group so presume it would be .org.
Having both names lets everyone find the site.