Buckit, World Edit, Permissions etc
Go on the Minecraft discussion website, hint hint, and find the mods section.
Depends what you want, I would have it so your mods have cuboid as your general folk have little to no commands unless they donate then maybe they get perks; kits, color of name, food for 1.8 kit or stuff like that.
Get a set of rules, maybe a website if it gets big, get TS, vent, mimble, you name it. Let me know if you have any questions too.