I am in the process of adding insulation to my attic in an old, double brick house (1949). The roof was redone in 2018. The ventilation is atypical and I am wondering if I need to install soffits and soffit baffles.

There is a ridge vent that runs the length of the roof. There are no intentional soffit vents; however, the soffit siding(?) is not install in a way that is sealed so there is significant light coming in everywhere.

There are large gable vents in 3 locations and one is on an addition which is just a few feet above the ceiling.

Should I install soffit vents first, install baffles on the spots with the most light, or are the large gables enough ventilation?