If this is your first flock, and you have no older roosters, I would cull him. Roosters raised with flockmates are quickly the biggest thing in the coop, the pullets are not ready, and he can become a bully. In my experience, constant crowing when you are around the coop has been a first sign of human aggression. A young rooster really learns appropriate rooster behavior from the older bigger birds in the flock.
However, if you want a rooster, I would get an older rooster. People always have extra roosters, some are such nice roosters that they have not gotten around to culling him yet. You want one that is close to a year old and non aggressive. Personally I have found that my day time predation is much less with a mature rooster, but he needs to be about a year old, the younger ones are only interested in one thing, and have not the maturity to be resoponisble for a flock.
Contact your feed store or local poulty club to find other chicken people. Recently, I went with a new breed, and he is working out wonderful with my girls. They adore him. However, I would like to worn you, that they may become barebacked. Often times people think that this is terrible and is due to not enough hens. Lately I have heard that it may be partly due to brittle feathers on the hens. What I have noticed is it bothers people more than hens.
Mrs K