Some CSS quick work is needed in a WP website. I'll be quick on the topics that are required to custom but let me know if you need more details.
1. Fixed header menu
2. Put to 2 different ads from google in a specific position of the site.
3. Translation WP plugin custom. (It should change position in the header and at some time show up the country flags in the vertical)
For further info please leave me an email.