Dave Chaffey at e-consultancy.
Before you begin any SEO campaign (organic or paid) its imparitive to know how search engines operate and how people interact with them. There are many guides out there where you can learn the "basics" of search engine friendly design and development (or you can hire a consultant). Search Engine Optimization (SEO) is arguably THE most cost-effective digital marketing technique, but also the most challenging to get right. It can get overwhelming with keyword research, link building, usability, and tweaking content. In the end, always keep measuring and tracking the data (sucess) and build off of whats working, and whats not working. If your site cannot be found by search engines or your content cannot be put into their databases, you miss out on the incredible opportunities available to websites provided via search - people who want what you have visiting your site. Always keep in mind not to go too overboard with content optimization or you will get labeled a "spammer" ot a "content farmer" which will designate you as a low-quality website/publisher.