Your list of pullets looks fine to me. As for the potential in getting cockerels, the hatcheries have come a long way with sexing baby chicks since I first ordered in 1975. Down through the years when I have ordered pullets, I haven't gotten surprised too many times with males. I will note...
I agree with DobieLover about not intentionally ordering cockerels because you will likely get a couple with an order of 25 "pullets". Your selection of breeds is excellent and they should get along well while noting the Leghorns can be a little more standoffish. I definitely would not drop...
Mixed flocks are great as you watch the personalities and traits develop for the different breeds. Curious as to what breeds you selected as some breeds cohabitate together better than others.
I agree about BYC being a great community. Even though I have raised chickens for a half-century, I continue to learn something new every day. One of my favorite quotes sums it up nicely:
"All of life is education and everybody is a teacher and everybody is forever a pupil."
- Abraham Maslow
My Dad always told me the fertile eggs are better for you. I have a lady here at work that only wants white shelled eggs for eating (boiled, scrambled, fried) but likes the brown shelled ones for baking. I have told her there is no difference in flavor but she swears there is.
Your comment about the brooder plate made me laugh as my wife could attest. Through the years while living in various locales, I have brooded baby chicks in a utility room, spare bedroom, garage, basement and my last two broods in a 6' x 2' aluminum cattle trough in the living room. My wife...
Welcome to BYC. You have a sound plan in getting everything ready before for you begin with the actual chickens. Through the years in my excitement and haste, there have been innumerable times where I have scrambled to get accommodations ready for mine. Chicken Math has been my nemesis on...