Help with Google and Search Engine Marketing for ecommerce Store

I'm looking for an expert in SEO for an existing online Voulsion store to increase ranking and traffic. Should also be able to help with Google Ad Word campaign and Google Shopping. I need a knowledgeable, experienced and competent person who will have ideas, make suggestions and guide me through the process. Good communications skills and a good command of English are essential, and care and attention to details are very important.