leave it at least 2 weeks, possibly more.
at 2 weeks check your gravity, then again at about 3 weeks. if the gravity hasn't changed you are done.
no need for secondary.
my most recent porter stayed in the primary for four weeks, and then bottled. after approx 6 weeks in the bottle it was VERY nice.
the main advice i can give you is just leave it alone for a couple weeks. don't mess with it.