Help Controlling Many LEDs

Hello,

I am working on mirror with a HUD (Heads Up Display). I am trying to plan out how I will control my LED matrices, however I am completely new to multiplexing. I was thinking of having 2 4*25 matrices. I want the dot matrices to be able to display the time, and scrolling text. What is the best way to deal with this.

Thanks in Advance,
Zach