Convert existing google sites website to Wordpress

MY website is for a startup providing software testing services for specialized customers.
The website is made with Google sites

Requirements:
Redesign the website on Wordpress to be:
1. Modern design, elegant.
2. Use more professional and matching pictures
3. Site can be easily browsed using any device
4. Optimized for speed
5. To be easy for us to add new content later by ourselves.
6. SSL certificate
7. Support website launching

You may propose more additions or features and define its extra cost -if any

Site:
https://sites.google.com/simuvill.com/simuvill/home