One important thing to remember, chickens poop a lot. If you plan on having them free range over your 1/2 acre, unless you fence off a "lawn" are, don't plan on walking barefoot outside again
I'm actually taking a different stance than most people here. I would look to the minimum number of chickens that will provide you with adequate eggs, rather than the most you can comfortably manage.
How many eggs will your family use? If you have a relatively good laying breed you can conservatively expect 5 eggs per bird per week, even with only 4 birds, that is 20 eggs a week - does that cover your needs? Taking into account you are hatching D'Uccles, you will need more chickens to provide that 20 eggs a week.
There are just two of us here, I wanted 4 hens, I started with 6 chicks, anticipating some loss - of course there was none

I did place one of the hens at 6 months, she was a good layer but kinda mean. Another of my hens is not a good layer (faulty shell gland, I think)- I should cull her. but, she is too much pet to eat her, and I can't in good concsience sell her as a layer - so, she is a freeloader for now.
We get about 25 eggs a week, we average use of 15 - so, have about 10 surplus a week - not enough to sell, but, easy to give away.
Realistically 3 chickens a week would give the eggs we use, for a minimum outlay on feed (I feed organic layer, so feed cost is a consideration) Also, three chickens could come and free range on the lawn occasionally without being too destructive.
And to the OP, welcome!