1. For PXE to work with UEFI you must have a job scheduled for the machine in the Management Suite.
2. There is a create partition action that can be added in provisioning. You would then deploy a captured version of the partition to the newly created partition. Easiest thing for size is simply to look at the size they are on your other machines. I believe that system can be about 100mb, and 350mb-400mb for the MSR. This is only necessary if you are using WIM images. If you are using an ImageW image, these partitions will get captured when you capture the disk.
3. Make sure you format the partition after you created it. That should fix the access error.