Search Engine Optimization is a continuous process but here is a very basic checklist when launching a new website:

1. Relevant Keyword-Rich Titles for each page

2. Keywords

3. Description

4. Using Heading Tags in the content - e.g. H1, H2, H3 etc.

5. Keyword rich anchors for in-site links.

6. Use ALT tags for every image that you use.

7. Submit a Google Sitemap.

8. Building in-bound links by link exchanges, ad purchases, directory submissions, article submissions etc.

9. Good, Original and Quality Content. Nothing attracts search engines to a website than this.

10. Last, but not the least - Search Engine Submissions.