SEO Blog Development & Management

I need a purpose-built blog that feeds qualified traffic back to my existing shopping page, which is already handled through my point-of-sale system. The site must be set up from scratch, optimised for search engines, and then managed on an ongoing basis so its visibility keeps climbing... (Budget: $15 - $25 USD, Jobs: Content Management System (CMS), Google Analytics, Keyword Research, Link Building, PHP, SEO, Website Development, WordPress)