Stable Season 3 Server Files and Host Requirements

I want to create my own server and need your expert advise.

• Which season 3 server files best to use?Link of the release if possible.
• What OS and SQL version to use on my host?

I'm not into premium files. I'm willing to learn things based on experience.

Thanks in advance.:thumbup1::thumbup1::thumbup1:

anyone?

OS :
Windows XP
Windows 2008
" 2003 ?
SQL: 2k