I can Describe its with an Example:
Let say, your long tail keyword is: Photo Retouching Services company in London
Now you make a landing page based on photo retouching services, Organized this page by minimum 350 words content with h1 to h4 Header tag and 3 to 5 unique images. In this 350 words content unique words meet 65 to 75 and keyword density need 1.5 to 2%. Try to put video, pricing and review on that page.
When complete landing Page:
1. Create Blogspot, wordpress & Tumbler and make at least 2 to 5 post with given instruction and link them with your targeted Landing Page.
2. Submit all page to facebook, linkedin, twitter, reddit and stumbleupon
3. Submit all pages to some popular social sharing sites like folked,myspace etc.
Now send request to Google (Webmaster Tools) to index your Landing and all web2.0 links.
Hope you get SERP positions shortly.