Before one begins to frantically put links on all possible sides, one should know a few things beforehand.
Search engines are a bit sensitive to tampering attempts. Detects a search engine link building manipulated, this can be punished unpleasant and leads to other things, as a good ranking of the site. Even if the link building is a motivated by commercial incentives, marketing process, it must be a way for the search engine "act natural". One should avoid too many links in a short time and agree that link building is a slow and steady process. Because general search engine optimization is a long-term effort is are only links consist of the permanent benefits.