What is the perfect methods of back-linking or forum posting?

[Jake]

Yes you have to register with a variety of sites in order to get unique IP address backlinks, multiple links from a single site have Diminishing returns.

Some forums require you to make perhaps 10 productive posts before you are able to add a signature link, where you may insert a promotional message as well on some forums. You can also create a link in your profile page on a forum.

Professional SEO services use tools like SE Nuke to streamline the process of setting up accounts and making posts, it is probably too expensive and complicated for a single site owner.