So...
You say you're an 11 year old noob to arduino (or at least certain applications of arduino) who says they know nothing about something that you want to teach others, so you are asking us to teach everything you need to know, and in turn, you will teach others what we teach you.
:-?
................
Okay then!
Well, where do you want to start? What do you know? What components do you have that you can work with (may not matter as you could just buy things, you have time)? We need some more info.
I would take a look online for tutorials on led cubes and shift registers, etc. Maybe a video tutorial...wait... 