External Linking Strategies
Once your website is all set up with the proper internal linking system and all the fun technical aspects of SEO you still have a lot of work to do.
The biggest part of SEO these days is building up relevent keyword rich anchor text links.
This takes a lot of work, but should be your main method of promotion.
You can post in forums to build your links up, you can write articles, or you can Blog.
Whatever you do, make sure part of your day, everyday is spent building up quality links back to your site.