Make corrections and create new 2 pages on existing site

Write, please, your price and timeline (deadline) for these tasks!

I need corrections for existing site (Wordpress)
1) Create and integrate in the usability of the site 2 new pages in SERVICE (one is like this here https://advensys-conseil.lu/main-page/services/tax-advice/ and the second is like this https://advensys-conseil.lu/main-page/services/for-companies/ . Design picture of second...