I agree with Jo57 that you should check with neighbours as crowing at 4:30 is not usually well received even in rural locations.
I would also take time to consider the pros (not many) and cons of keeping a cockerel and not be pushed in to making a hasty decision.
You can eat fertile eggs, but if selling them some people do not like the idea of it. You do not have to leave the eggs under your hens so need not end up with chicks. I think your hens may go broody more often with having a cockerel.
Three hens to one cockerel should be alright but he will be constantly mating with them and may have a favourite which can lead to feather loss and injury. Cockerels can be vicious but you would not know that until you get him.
If you decide to hatch some eggs it is best to have the broody hen in her own coop as the chicks eat chick crumb which is not good for layers. Some chick crumb has ACS added which would mean you can not eat any eggs from hens that have been eating it. Chicks then go on to growers pellet from 6-8 weeks old until they are ready to lay so they need to be in their own enclosure for around 20 weeks. If you hatch more than one batch you will need another enclose as mums will fight to the death to defend their chicks. One of my broodies is on her second batch of chicks this year and there is possibly time for another one. It really does take condition out of a broody so you have to be careful that they stay in good health and build them up each time.
If your cockerel and hens are not the same breed you will probably not be able to sell the chicks as mixed breeds are not popular. You could also get lots more cockerel, people say you get 50/50 but that would be if you were lucky. I have even had 5 out of 5 hatched cockerels, this is probably why your friend has too many!