There are no "best settings". Each shot is unique. A head shot with flash. A group portrait outside in the backyard. A person at a podium giving a speech. A picture of some kids playing at a fire hydrant. What kind of "People photography" do you want to do?
So, there are no best settings, you will need to set things based on conditions. I would just use "P" mode and not worry about it unless you really need to set something specific like depth of field.
