Here is my example of the unattend.xml file and sysprep commands. https://forums.fogproject.org/topic/11920/windows-10-1803-sysprep-problem/7
The unattend.xml file is used on the other side of sysprep to build the target system, its not used to build the golden image. Since you are just getting started with Win10, you have a long way to go. You won’t have the flexibility in customizing the image as you had with Win7. At times you will go mad trying to tweak the win10 image into doing something simple (like when adobe acrobat is installed, but win10 insists on using edge to display pdf files).
Also a great resource for building golden images is the Deployment Research web site. There is a lot of great examples there you just have to dig for them a bit. https://deploymentresearch.com/building-a-windows-10-v1809-reference-image-using-microsoft-deployment-toolkit-mdt/