I'm not familiar with NetBiz but you need to be wary of any company that guarantees search engine positioning. There simply is no silver bullet to search engine placement and most of the results will have to do with the quality of the content on your website as well as the links that are pointing to your website. I would recommend picking up a book on SEO from Barnes & Nobles. It will be around $35 dollars and will give you a sense of what search engine optimization is all about. You might be surprised to learn that the essential points of seo can be learned in a few hours.
If your still interested in NetBiz after learning a little bit about SEO, be sure to ask them for some client websites that they have worked on.
SEO Books
Search Engine Optimization for Dummies
Search Engine Optimization An Hour A Day