Nice to meet you Chris and Lauren. If you are considering a prebuilt coop or kit, they generally are cute but, not made to withstand weather extremes. Also the mfg. tend to over estimate how many birds can comfortably fit inside. The average chicken needs 4-5 sq. feet per bird inside the coop, excluding roost bars & nest boxes. The outdoor run should allow 10 sq.feet per bird. When chickens are crowded they act out by bullying, feather plucking and at extremes, even cannibalism.
Ideally a bigger coop is better. Chickens are very addictive, and I can almost guarantee that after the first ones you will want others. Better to build larger than to need a second coop or a third to handle over flow.
Please check out the Learning Center which should answer most, if not all, of your questions. Thank you for joining us at BYC.