Wordpress multi-site - new subdomain changes

Can you tell me how long it would take (and the cost) for doing this project? I am on Wordpress multi-site, and my main site is whiteglovecarpet.com. I would like to have all of that content (about 30 single landing pages) go to a new subdomain, landing.whiteglovecarpet.com. The new site I designed is at new.whiteglovecarpet.com. I would like all of this content to be at [login to view URL] (including changing all internal links) Thanks in advance for the bid,