Comprehensive VPS Setup & Migration

I am in need of an expert for transitioning my VPS server. I'm shifting from an existing VPS server to a new VPS KVM server. My current one holds roughly 30 modest sites, most of which have databases due to the CMS templates.

Here are the necessary tasks:

- Setup of the new server with Webmin
- Migration of all sites from the old to the new server
- SSL certificate installation
- Firewall configuration

Since I lack specific instructions for the firewall setup and the SSL certificate installation, I will appreciate if a professional freelancer brings their expertise to efficiently configure it. I envision a robust and secure setup that would protect from potential threats.

Ideally, I'm looking for someone with:

- Extensive server setup and migration experience
- Proficiency in Webmin
- Expertise in SSL certificate installation
- Known for firewall configuration

Your role will not only include the raw setup but also ensuring that all sites function flawlessly post-migration.