How can I install google play on my already rooted device?

I have already rooted my device with kingroot and have tested it. Now is there a way to install google play?
My version is 4.5.5.1.

I have seen other threads with tutorials on how to get google play but all include using a program that also roots the device. I've already rooted and since im a noob I dont know if using a rooting program again will damage my device.

Thank you