Help with coop design!
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You don't have to free range, but it would be good to provide an enclosed run for them of appropriate size. General guide is 10 square feet of run per chicken. A 10 x 10 run is good for 10 chickens or less. There is plenty of information available about coops at top of page link. There is also a thread with over 1 million views,(not posts) here.
If you are not able to have a secure run for your chickens then they will be similar to battery hens at the corporate farms. Try your best with what is available to you.
WISHING YOU BEST and