Focal length for capturing interiors & buildings

Hi,
Newbie here, excited to try RC! I’m interested in modelling spaces, both interior and building exteriors. Could someone please guide about what would be a good focal length for interiors and exteriors. Is it ok to go wide like 16mm? Any thumb rules about how dense the shots should be and how much overlap should be there? Thanks in advance.
Raghav

I suggest using 20 or 24mm lens on a fullframe and having a 60% overlap.