For linux web servers you can follow microsoft official documentation
For windows download the drivers here: https://github.com/microsoft/msphpsql/releases/latest then place the .dll in the extension folder of your php (ext).
You can then follow the wiki : https://github.com/AzuriomCommunity/Game-Flyff/wiki
You can change the default salt of 'kikugalanet' in your .env (root folder of azuriom)
Simply past this inside:
MD5_HASH_KEY=my-new-salt
If you want to create your custom theme or modify one you bought at the market have a look at this "default" theme for flyff: https://github.com/AzuriomCommunity/Flyff-Theme
Feel free to contact me on discord Jav#7775