You've got a lot of questions, rightfully so, but I think you'll find a lot of good answers by, first, doing some research on this site about your concerns, and, second, picking up a good book... it sounds like the book featured on this site would be good at this point:
"Raising Chickens for Dummies" , not to take offense at the title.
This book, I think, takes you through questions at the planning stage, such as,
.....how many chickens can I comfortabley take care of?
.....to heat or not to heat?
.....free range or penned? etc.
You can flip through the pages of the book virtually on
Amazon.com. That's what I did.
There is also "Story's Guide to Raising Chickens", which is thorough, but not necessarily the book to read,
And a few different books on hobby flock raising, which you could also read through, or read reviews on, on
Amazon.
Sounds like you have a good situation to start a flock! Make sure you have a safe, secure coop & run area before you have adult chickens,
unless you're prepared to keep them inside a lot. This from my experience.
Good luck!