UV Unwrap simple object and create texture from its own materials, preferably in Blender

I have a dice model for which I'd like to unwrap it and create a black and white texture for it afterwards: white for where there is a number , and black elsewhere.

I've attached the dice model and an example texture for another dice I have as a reference.

I need a semi automatted uvw unwrap that's good enough, nothing fancy.

Budget for this is 10$.