Making to the top of the Google search page is often a misunderstood affair.
Please do not pay anyone to help you get there without reading this information first! When you are well informed you have the tools to instruct a supplier.
Pay close attention to the black hat methods in the Wikipedia article.
Some SEO firms are still using this practice which can actually hurt your SEO.
Here is the article from Wikipedia on the History of SEO
( Note when you download the Google Guide, the first part of the page is blank... Scroll DOWN)