build a bulletin board driven website, install themes and addons for site www.ir35substitution.com

I am looking for a bulletin board driven website. Its already installed phpbb fresh installed. I have theme forest theme and plugin to install - milk (already purchased) and flight deck. It then requires some setup for users to post/join so needs relevant categories for - Industry - Building Healthcare Engineering Computing Then under each industry the following needs to be created - Substitution needed Substitution offered users will post whether are offering themselves as a substitute or are looking for a substitute. The site will need ad banners placing to monitise through the milk theme for advertisers to purchase ad space. Default user accounts need creating so people can post, edit, and admin accounts. Also needs a landing page creating to explain what the site is for, how to advertise on the site, how to join. Would be useful if there was a calendar plugin where people could put the dates they are offering/want a substitute in the posts above (not sure if this is possible). The site is to introduce contractors to each other, so they can offer substitution services between people of equal skill levels so they can actively find a substitute for the new uk tax laws which requires substitutes in order to be a limited company contractor. The site is free to use/join and is an introductory service between limited company based contractors.