Ah yes, I am familiar with the woes of expecting eggs from pullets. My first girls were only 4 months old when they all started laying, egg-cellent! My newest girls hatched last May and only 1 is laying so far, and they're 8 months old, not so great.
Depending how old your older hens are, I don't think I would expect much from them until around March. Usually, first year pullets will lay all through their first winter (my first ones did) but eventually they'll slow and stop completely over successive winters... daylight and molting are key factors in deciding that. There are a ton of opinions on how to keep birds laying all through winter, but it needs to be planned and a supplemental lighting schedule started in the fall.
Once those hens start laying again, you'll be swimming in eggs. Do you plan to sell some? Especially if new chicks are in your future... just give them time, they'll start earning their keep. You can integrate chicks as early as 4 weeks old if done properly...
Integrating at 4 weeks old
You Certainly Can Brood Chicks Outdoors
Best wishes with your flock!
and Welcome to Backyard Chickens. 
