Welcome, Rezia!
You are off to a great start. A few more tips (things I learned the hard way) to add to your list...
Make every part of your coop accessible. They
will lay in the farthest from the door, smallest to crawl into, most inaccessible place you could have ever imagined. Luckily, I had small children I could stuff under to retrieve eggs, but as they have aged (the children, not the chickens), they have become less compliant.
Socialize them from an early age (the chickens, not the children). They don't need to be lap chickens, if you aren't so inclined, but you should be able to pick them up for examination without having to chase them around the yard for an hour and a half, and having the shrieking scaring the beejezus out of the chickens, the children, the neighbors, and yourself.
Get the number of chickens you think you will ultimately want
all at once. Chicken math will eventually come into play, but it can be delayed if you know what your needs are and go with it from the start. If you think you need 6 layers for your family needs, don't start with 3 "just to see how it goes", with the intention of adding 3 more later. Chicken introductions can be very difficult and very stressful (for both you and the chickens), not to mention the biosecurity risks that come with continually introducing newcomers. If you know what you want, just go for it.
Good luck, and keep us updated.