Making plugins (no hates)

[MCFreak999]

I know you are blaring out me "HAHAHA you don't read! U r a newbie!", your right. I am new. I just need some help with making a plugin for my friend (dannyboy06)'s server. I know only that java is basic, and it uses stuff like {} [] (), and minimal calculations. I just need some help when developing this plugin. I am trying to make a plugin which allowes you to do:
/tag set [tag] with color-codes

and then when you typed something in chat this would show:

[tag] CKcraft900: Hello

I dont want:

<[tag] CKcraft900> Hello

My name in MC is CKcraft900.

My server is SamuelCraft.mygs.co.
Not on 24/7, more like every once in a while.
I know I use a noob website
(server.pro)
But i don't really care