The best size for car garage

[pit76ty]

Hello ALL
I'm doing research for size and colour for car garage.
all I need to design a car garage and need to know what you think about the size? and your preferred colours?

so please tell me what is preferred size of garage for one car and two cars.

I want to find out what is the most preferred size og garage to store a car meybe with small workshop for DIY ?

And will you need rooflights?

And do you need extra side door?

thanks for your answers
Pit