SEO Website

I am a trainer of an online accounting software package called Xero. I would like to lift my ranking on google. They are low value keywords and I would like to raise my position on the first page from approx 10th to 5th in the UK (or higher if possible). I would like to pay for assistance for three months to understand the impact SEO can have for my business. The key words are Xero Training, Xero Setup ,Xero Conversion and Xero help. Examples of previous achievements please.