See below for pricing, although exceptions can be made.
You need to have a Discord account, becuase that's where I'll get back to you, no exceptions.
A plugin that adds or modifies basic functionality, no gamemodes or minigames.
A plugin that adds or modifies more advanced functionality, possibly gamemodes, no minigames.
Is configurable, MySQL or SQLite support can be added, see below.
A plugin that adds or modifies advanced functionality, can basically be anything. Keep in mind that pricing can vary a lot between advanced plugins.
Contains MySQL or SQLite support and is very configurable without extra cost.