When it comes to SEO, The offsite factors are important than on site factors. As you know main important thing is link building and optimizing off site factors to reflect higher search engine ranking.
Follow following steps to increase your ranking in search engines:
1. Build a good content rich duplicate free web site
2. Build a web site like a pyramid, hierarchical way and link pages together as a one affiliate web Site
3. Put a “Tell a friend” features on the site, so that web site visitors can tell about your web site to others
4. Prepare a ebook about your site or any expertise you posses and distribute it in the web. Search web as “free ebook submit” to find web site which you can submit the e-book
5. Submit your site to free directories in the net under appropriate category. Search web as “free directory list” and you’ll find enough directories.
6. Submit articles to free article directories. Optimize your articles for a keyword you select before you submit the articles. Search web as “free article directory list” to find article directories.
7. Submit your site to blogs and forums. Participate with them first.
8. Give something free to others, an e-Book or article.
9. Submit your site in yahoo answers and Google answers.
Bonus:
Link strategy #1
Gather URLs from competitors and leaders in your industry
You may link from your direct competitors,indirect competitors,sites selling same affiliate products/services, and others.
Link strategy #2
Find tools that provide link information