Convert a website from .php/html to Joomla

I run a website and would like to update it to Joomla to have a frontend, menu, login area for users (doctors, practice managers and agencies)

There is a vacancies page which I am looking to improve at some point down the line. The site has curl messaging which allows text messages to be sent to users

I have all the graphics necessary courtesy of Istock and am able to provide an Artisteer template for the site