If you have the static HTML and CSS/JS files ready, then study using Diazo (plone.app.theming) to do the rest of the work. Search for "free open HTML templates" that might be good enough as your theme base. Check out https://github.com/collective/plonetheme.diazo_sunburst that might be an example showing how Diazo works. Or see http://mydoctor.tw a live Diazo website. You can hire an experienced developer to guide you through the Diazo theming work.