Come on guys, he doesn't even have the coop built yet.
If I were you redsox, I would go ahead and build your coop.
Put your order in for some pullets around the end of May, first of June. Plan on picking them up in person, shipping on those birds will be HIGH!
Most of the time they will be about 17 weeks old at that point. Moving them into a new house will set them back a bit, so expect it to take 2 - 4 weeks before they start laying. It also depends on the breed you are thinking of getting. The sex linked hens will lay a lot sooner then the heritage breeds.
You won't need any supplemental light or heat at that point in the year.
Keep them until your egg production drops off due to the weather, day length, etc. then sell them. Don't feed them thru the winter just to get a couple of eggs a day off of 25 hens. Next year rinse and repeat.
And above all, build you coop so it is predator proof. You will have some money invested in your flock, make sure that br'er fox or br'er raccoon can't get to them.