You don't need a rooster. But if your going to let them free range the benefit of a royster is they'll often protect the flock and take one for the team should there be an attack from a predator.
The drawback is sometimes they decide they are alpha and attack you or most often women or children.
This is easily corrected by confidence and showing them who is boss. It took my wife a while to get the hang of it
If you're just getting a few for eggs I'd make a coop and a decent sized run. You can let them out under supervision for safety.
Rhode Island Reds, Cinnamon Queen, Blue Sapphire and Black Sex Links are all good choices. Avoid straight run of any breed.
My favorite breed are Polish. I lost one just like this a couple of years ago........ Her name was Disco
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Good luck with it, they are fun.