You did not say if you have built your coop yet although the implication of your post above is no.
Your focus on nest boxes makes lots of sense to me, I have rebuilt mine at least four times, think I have it right now. I started with 7 hens so two nests worked but chicken math intervened and I expanded to four based on 
@aart 's model. Then my flock grew (now 25 hens) and I encountered an egg eating issue; nests became seven with a roll away floor. First iteration floor allowed the hens to reach the eggs, added width and increased the pitch; works well but, at the moment, I get almost zero eggs (LOL) . Research and planning is great but sometimes we don't really know how our chicken life will unfold.
My real purpose with this post is reactive to some of the comments above. The 
most critical thing with chickens is their coop/run - does it work for the flock and does it work for 
YOU? I made mine large (designed for 40), walk in and well suited to my climate & environment. I spent almost a year researching and, fortunately, got that part right. I  chose a proven design (Woods fresh air style), elevated it close to a meter off the ground (deters critters & adds run space that would otherwise be wasted footprint) and fully enclosed & covered the run (I no longer allow free ranging -too many predators wandering about and now the threat of avian flu particularly during migration seasons).
You do not need heat, do not want insulation!!!
You do want excellent ventilation, space sufficient to flock size, appropriate roost length coupled with drop boards & frequent cleaning, deep bedding in the coop, deep litter in the run, easy access inside the coop, electricity for light & water heating.
All easier if starting from scratch but attainable even with pre-existing sheds/buildings.
@aart, among others, is brilliant and offers common sense/practical guidance on all of these topics. I strongly recommend her articles and comments.
Good luck with your journey!