Hello, good morning and welcome to the BYC community

from beginner to beginner, research is important! Be sure the ground, where the coop will be, is leveled. Build a larger coop than what you have because chicken math can get you in trouble and its not as fun subtracting.
My favorite breeds vary from one reason to another. Rhode island reds and Barred-Rock are good layers, orpingtons are big and beautiful, and Easter Eggers are just fun to look at but I couldn't tell you how good they lay.
Depending on where you live, there may or may not be a vet. The closest vet for me is 30-45 minutes. It may be worth knowing in case you ever need one. Check the flock for any mites or lice at least once a month.
Be sure to feed according to the age of your flock and limit treats.
There is a ton of information here

wishing you the best of luck!