The address name means nothing. It's all keywords and phrases put in behind the scenes, and of course traffic. Other things factor in too such as does your site do what you say it does? Do people go to your website then back out or just leave? Is your site useful? All of these things matter more than the name. The benefit to a good name is that it is easy to remember for consumers, which might help in the web traffic department.
Using Realtor in the website name is against NAR rules, unless you had something describing yourself such as scottelwellrealtor.com.
Good luck to you, I wouldn't go it alone and reading boods on SEO is worse than watching paint dry. At least when paint dries you know what happened, and why it happened. SEO books leave you more confused than when you began the book.