Create a "turnkey" and "site" on Joomla

You need to create a website on the Joomla platform. The site must be made with sharpening for promotion (the correct simantic core, registration in catalogs, etc.). Design. The layout. Launch. The size of the site is approximately 20 pages.
The direction of the company’s activities is an advertising agency. Now the site is, but it is very old and not sharpened for promotion.