Need a great website similar to...

I am after a website which is similar to http://m.divorce-online.co.uk/index.html, the main difference is we will have no client area, once a person pays we deal with his case via email and phone. We also deal with a different area of law than divorce. Website must be: very quick loading, seo friendly so we can add or change seo tags etc., mobile friendly. I do not mind if it is using WordPress or other provider or framework as long as it does not harm my seo and the website must be bug free. I already have hosting. Ideally looking for it to be completed within a month. Many thanks, Shahid