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You can describe the meta tag description, content and keywords just the way we do in any static website... You can define the content like this...
<meta name="description" content="Description of your website.... What your site is all about...">
and
<meta name="Keywords" content="Here you can describe the keywords used in your site... In your case you can use book names, etc.... Check out for some seo keywords on google for your pdf books"...
You should also popularize your website, by creating accounts on social networking sites like, Facebook, Google Plus, Linked In.... Do remember, the more good keywords you use in your site and the more links you give to your site... the more better SEO u r doing/performing.
Hope this helps you. Feel free to post your question if you still have any doubt.
Thank you.