If you do not own a light meter, start by giving your camera an exposure of at least 1/2 second and adjust from there.
Ọ bụrụ na ịnweghị mita ọkụ, malite site na ịnye igwefoto gị ihe ngosi nke ọ dịkarịa ala 1/2 nkeji ma gbanwee ebe ahụ.