Hello Mike from NYC! and welcome to BYC. Regarding your property, no rocks and stuff won't be a problem for the birds, As long as you can find or make a flat place for the coop/run to set against the ground, you can make a start. Chickens will in short order turn the most beautiful lush lawn into dirt/rocks/what have you. So perhaps in that way you are just ahead of the game. I suppose you understand you need a structure of some kind to protect the birds from being another mans or animal chicken dinner, much like your hive protects and houses your bees. The BYC standard is 4 square feet per bird in the coop and 10 square feet per bird in the run.
From there you can size the coop and run to the number of birds you wish to keep. Bigger is always better in coops/runs, but don't go crazy or you will need to spend more than you can at this time. Birds are a lot of fun, I believe you will enjoy them, there is a lot to learn, but if you can keep bees, then you can do this as well. Look around the site, the sections on coops, and feeders, chicks, health problems, most anything you need to know is right here. Ask your questions with as much detail as you can, at the time. Don't worry about knowing it all, you will, if you wish to. People round here are most helpful and nice, day by day your knowledge will grow and you will find yourself answering questions for the new bird keepers before you know it. Pitch in and help wherever and whenever you can. Others will do the same for you.
Best wishes on your new endeavor,
RJ