Glad to meet you, Rebecca, and to be introduced to your chicken whisperer! That is so cool that it's a family project.
I hope you can keep roosters where you live. You mention you are rural, so I hope that's not a problem, as it is for those of us who keep chickens in towns and cities. But people do rehome unwanted or badly behaved roosters. You can post to Craigslist in your area, or use the links here on the Free/Rehome forum and here for posting an ad to your state group. In all your ads, mention your town or county and state so folks know how feasible it is to come get a rooster. Also include a picture of the rooster, and any information you have on his age, breed, breeder and behavior. Just the sorts of things YOU would want to know before adopting a rooster!
Here are my favorite beginning articles that helped me as a newbie. I hope you will find them helpful as well. All articles are short, have illustrations, and reviews, which are often worth looking at for the comments.
3. Ventilation (important to chicken health), with helpful links to coop designs organized by climate (because what is just right for my New England hens won't work for my brother's Arizona chickens)
3(a). Farmers Almanac on Building Coops (Includes size requirements!) Allowing plenty of space for chickens is really important because, even as chicks, they will start pecking each other or plucking their own feathers, or become unhealthy if they are overcrowded. Here is a link to Colorado State Extension's publication on space and temperature requirements for chicks as they age.
A. Use the SEARCH button, but use the Advanced Search choice, and select ARTICLES at the top of the box. Just enter your keyword(s) and scroll through your results!
B. I find it helpful to notice the rating and reviews. All articles are by BYC members, and all the reviews/ratings are as well. The ratings help a newbie like me sort the most useful and reliable articles.
C. You can bookmark the articles or posts you think you want to refer to again using that bookmark icon at the top of articles or posts. You can find them again by clicking on your own avatar and looking at the list of bookmarks you have built up!
Notes about where to put a coop:
1. As far as you can, put a coop and run on high ground, that drains well, so you won't have so much muddy coop problems. Chickens need to be dry, dry, dry.
2. As far as you can, put a coop with the ventilation lined up with your prevailing breezes, and away from the direction of your storms. If you are not sure of these (who is these days?), check with your local National Weather Service website.
3. As far as you can, arrange for some sort of shade over your coop and run. Preferably deciduous so the girls will enjoy winter sun, but summer shade.