LEDs?

So on a full shaved arse end I want to run LEDs as brake and turn signals in the little gap between the tail gate and bed.Want to do it in 3 secetions, left turn singal brake light, right turn singal. I want all 3 to light up when I brake unless I'm signalling then that one will flash.

Any idea on where to get the LED strip to do this and how to wire it all up?