While your chickens are young (between 6 months old and 2 years old) expect (on average) 2/3 of an egg per chicken per day. More in the summer and less in the winter.
Clean the coop once a year. The droppings form a symbiotic relationship with bacteria that efficiently eat ammonia. The coop will wreak of ammonia from chicken droppings soon after you clean it, and until a new bed of droppings mature to 100% handle the ammonia. The chickens will suffer from ammonia poisoning. The coop must be well ventilated at this juncture.
Red Stars are good chickens to start out with. I also like Barred Rocks.
I live in an area that sees colder winters than yours, and I've never utilized heat lamps. I do utilize a thermostat controlled heated water bowl in the winter.
In order to get more eggs in the winter you will need to illuminate the coop for about 14 hours per day. A few hours of electrical light in the early morning and a few more in the late evening, along with sunshine in-between, will suffice.
Chickens will live roughly 8 -10 years. If you are also going to eat them, I recommend that you do it by or before they are 2 years old.
I believe that most of the big commercial egg farms turn their layers into roasters at the age of 12 months, and certainly by the age of 18 months. They drift slowly into terminal egg laying decline after they are about 2 years old. At 5 years or greater old their meat is like eating shoe leather. Ask me how I know.