1Pick a Domain Name that Reflects Your Web Site
Above all else, your domain name should reflect what your web site is all about.
2Pick a Domain Name that Contains Your Web Site's Keywords
Try to pick a domain name that contains your most relevant keyword phrase because some Search Engines place relevancy on them.
3Pick the Best Domain Extension
Although there are many new domain extensions available, dotcom is still the best choice. When typing in a web address, Internet users automatically want to type in a .com extension, since this is the extension that has been embedded into our brains from the start.
4 Pick a Domain Name that will be Easily Remembered
With millions of web sites accessible on the Internet, it is also very important to pick a domain name that will be easily remembered.
5 Don’t use Dashes and Underscores in Your Domain Name
Don’t use dashes, underscores or any other characters within your domain name that may cause confusion. This may lead people to go to the site with the same address as yours but no dash. This means not only will you lose traffic, if the site is similar you are transferring it to your competitors.
hope help