I would wait because not a lot of people have the ability to raise chicks in the winter.Both. We added new chicks this past spring along with 7 or so older laying hens. Now we have several that are laying fertilized eggs. We do a have a barn and yes, I am aware of the mess young birds create. I guess getting rid of the chicks we don't want might be more challenging in the winter too, so that's something I didn't consider.
I crossed my chickens to make dual purpose birds for meat and for eggs so the ones that I am not going to use as layers I am going to use them for meat for my family.
I'm going to keep some of my pullets in sell them at point of lay in the spring...
If you can find people that would want to buy them then go for it, but it's kind of hard in the winter.