Help with installing Windows 10 on 27inch Late 2014 iMac

hello, I have been trying to get windows on my iMac late 2014 using Bootcamp. I have installed the iso off the Microsoft site and set it up using bootcamp. My Mac boots into the windows setup menu and first time it couldn't find the petition when I had selected it and second time I deleted the file and started over and then I thought as it started setting up and everything got a tick during setup until it got to "finishing up" and then it failed and gave me and error saying it couldn't get the the next phase of the setup and then restarted and put me back into MacOS. Does anyone know how they could help me get windows on my Mac?

Thanks!