(optional) MySQL integration
Installing MySQLoo module
MySQL integration is really simple. Install MySQLoo from here https://github.com/FredyH/MySQLOO/releases/tag/9.6.1 .
Then next up, drag and drop it to your servers garrysmod/lua/bin folder. Very important, gotta be that one. It's the same where e.g. gmsv_gmbc is inside.

Configuring your MySQL integration
Look inside of the folder of the addon for mysql_example.txt

Rename the file from mysql_example.txt to mysql.txt
After that, you can open it and enter your MySQL credentials

Now just save the file, reload the map and you're done :)