Looking for some guidance

I run my own domain which lost its main server (hardware issue) about two
weeks ago right as I was leaving for a two week family vacation.  While I
was gone, I ordered a new HP Pavilion Desktop TP01-3055xt as a replacement
and bought from FreeBSD Mall the 13.2 AMD64 DVD.

The Pavilion is running UEFI, but oddly it wasn't recognizing the DVD as a
boot media until I went into the boot menu at startup and
specifically selected the DVD drive.  I also noticed that there was also
the "Windows Boot Manager" listed which it seemed UEFI was default.

The Pavilion came with a 500G SSD and a 2T HD.  It seems that Windows OS
has been installed on the SSD leaving the HD as available storage.  I have
also installed the system disk from the old server (1T HD) but it was
formatted for the old bios (no UEFI boot partitions).

After I booted up the FreeBSD DVD and entered shell mode I see (using
gpart show) that
nvd0 (SSD) shows the following partitions:
    efi (260M)
ms-reserved (16M)
ms-basic-data (476G)
ms-recovery (5.3M)

The ada0 drive is my old system disk with the following partitions:
   freebsd-ufs (/) (50G)
   swap (16G)
   freebsd-ufs (/var) (100G)
   freebsd-ufs (/tmp) (100G)
   freebsd-ufs (/usr) (200G)
   freebsd-ufs (/home) (465G)

The ada1 drive is the 2TB with the following partitions:
    ms-basic-data (1.8T)

So my questions are -

1) What the heck is this "Windows Boot Manager" and can I use it or must I
destroy it?
2) Do I need to add the loader.efi to the efi directory on nvd0?
3) Can I mount nvd0?  What mount type (FAT32?) do I use?

That should get me over my first hump.  My current plan is to install to
the 2T hard drive and use the old system disk as a reference point to
retrieve my DNS/Mail/Firewall stuff.

Thanks for any help,

Patrick