hi, thx for asking,
on VPS you will have some Linux operating system probably, you can choose some like CentOS, Debian. I was using CentOS. Also then you should find on the google tutorials on how to setup so called "LAMP" - linux apache, mysql, php - these software is needed to run a website.
After this you will need some control panel if you dont want to bother yourself doing everything on linux command line. Im using Kloxo hosting control panel, its free. another free panel is Webmin.
Some hosts provide VPSs with already installed LAMP + control panel.
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