FastLED - drive two led strip with different fuction via Arduino

I’m preatty new, and I’m on my first project.
I’d like to realize with Arduino a code to drive two different led strip, with different functions.
The first strip using led strip 288 RGBW, 5050, 12mm White Flex, 5V : 12 leds have to blink random (random on/off) for a random time (between a range), using a single LED color (red).
The second strip, using 288 RGBW, 5050, 12mm White Flex, 5V : 3 leds, must stay Always on (befor and after first strip is working), using a single colow (white).
I’ve try something using FastLED libraries, but result is not once I’d like to have.
any suggestion?