Configure the file sqlconfig.yml after installing the plugin and restart it to establish an mysql connection. Without this, the plugin will not work.

Creating kit requires only a short command in chat, it will save context of your inventory as a kit. It means, is has full support for customized items, enchanted armor and weapons, renamed items with lore, banners and shields with patterns, custom nbt, and possibly even mod items (not tested).
To create a kit, use:
/kit create kitname¹ cooldown² permission³
1 - any name for your kit, no spaces or specialized characters.
2 - cooldown in seconds
3 - permission to get this kit (leave empty if kit needs no permission)
Currently mysql is required to store cooldowns, even for standalone spigot servers.
Use /kit help ingame to see another commands.