Install of Win10 failed with BootCamp 6

Using an external Mac OS-X bootable drive open Disk Utility and reformat the disk to GUID patition map and create a journaled file system partition for the Mac OS. Once done install a fresh copy of OS-X onto the SSD. At this point I would make sure the systems firmware is up to date. Follow this Apple T/N: About EFI and SMC firmware updates for Intel-based Mac computers. Make sure you are at the level listed or newer. I would also make sure the OS updates are also applied at this point.

Here is the Apple page which goes over the process of setting up Windows with BootCamp: Boot Camp Support

And here is a link to the Windows drivers you'll need: Accessing the Windows drivers via Boot Camp Assistant app.