Transfer from wordpress server to netfirms.com server

I have designed a site at recoverthegospel.wordpress.com that I would like to have under my domain name http://www.recoverthegospel.com which is located at netfirms.com? Can someone help me how to do this? Also, once I do this, will I be able to edit my blog just like I did from the dashboard on wordpress.com? Do I need to update the software on my server? Thanks for your help.