Ranking on page 2/3. How can i move up?

Hello

I have recently found a niche that has very low competition and a high amount of searches per month (upwards of 165 000 ). I have added content to my brand new emd website and without any back links, three of my keywords totaling (9000 searches per month) have ranked on the 2nd/3rd page of google within one week. My main keyword is currently ranked 65 on a keyword that has over 165 000 searches per month. Keep in mind that this is only within one week of my website being created and no seo completed. Last night, I followed the "[Cheap SEO Guide] A Dolla' and a Dream", which instead of using the web 2.0 as the main site, I created a article where i linked back to an article on my main website.

So my question is, does anyone have a recommendation for a seo service that will bump my 2nd/3rd page keywords to page one.?

Thanks for taking time out of your day to respond, I really appreciate it!

kind regards

ABCman