Depending on budget, you have several options. In descending order of value:
1. Attendance and promotion in Google, the better Google no one will tell. Enter "website promotion" - and here the move of the office, who himself brought in the top 10. That is what I do. Go to the site, there will be contacts - voila!
2. If something is wrong (long, expensive, unclear) - to move forward. Second page, third. Tenth. No? Well, then again Google: "exchange of freelancers". To register, go to SEO section, create the project, write the terms of reference. Short and to the point. "There is www......., want to catch up with buyers, the budget of so-and-so". Or % of sales. Freelancers respond, choose, and voila!
3. Enroll in an Internet marketing and search engine promotion. Surprisingly, search for it in Google. Voila!
P. S. let the door Hit you in the sedition - 4. Download training course torrent. Voila.