You're going to want to start here:
https://developer.valvesoftware.com/...icated_Servers
For focusing on config files, you want to make sure you read the
gamemode_casual_server.cfg section.
As for a 5v5 tournament, you're probably speaking of doing a competitive scene.
Plugins that would work:
WarMod -
https://forums.alliedmods.net/showthread.php?t=225474
Pug Setup -
https://forums.alliedmods.net/showthread.php?t=244114
Get5 -
https://github.com/splewis/get5
It's not wise to download a fully configured server for a varieties of reasons.
If you need one on one help you can message me and I'll set you up with whatever it is you're looking for.
However, I'm sure you will find a lot of people willing to provide you with guides or tutorials.
Though, you will find everything through Google and YouTube. There's tons of information out there on exactly this.