Introducing a new cockerel to the ladies

I'm assuming he's free from any illness since you've had him for a while, so just put him in with your girls. The usual rules still apply - he will need to be put in his place by the hens before they will accept him, so just keep an eye out to make sure he does not have too rough a time of it and keep the purple spray handy in case of injury.

He'll soon settle down and cherish his new little harem!

It's exactly like introducing new hens - the fact he is a male should make little difference. They will still have to sort their pecking order out and as he is a cockerel he will have a slightly different role in the order - slightly to one side so to speak. When he's a little older he will rule the roost, but expect him to get the usual treatment when you first introduce him. My hens accepted a cockerel very quickly and it is lovely to watch him call them over to little treats he has found for them - it's a good idea when feeding anything that could be classed as a treat to feed him first, so he can call them in and they can see how good a provider he is. Gets to a hen's heart every time!