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If you want to make multiple copies on DVD or Blu-Ray I would suggest using the facility in Create Disk to burn to a .iso disk image file, then use a third-party program such as imgburn to burn your disks from that. This ensures identical copies and is also probably quicker.
Blu-Ray is potentially much better resolution than DVD although it obviously depends on the quality of your source material.
I'll leave your other questions to the expert contributors on here.
Fenman - Thanks for your advice. The burn iso file sounds like a good option. In further consideration, I don't have a Blue Ray burner drive - so, looks like I'll want the highest resolution I can manage for playing from a USB drive, and/or a DVD drive. I found earlier posts on the forum with advice (below), which seems senisble. Would you agree?:
"You may want to look into creating an AVCHD Disc on DVD. This is 720/60p and 1080/60p quality on a DVD. No BD drive is needed, just a plain DVD drive. The created disc can be played from any pc with only a DVD drive and on higher end Sony standalone BD players."
Also,
"I would produce those on my timeline to 4K. And put the mp4 file on a small usb flash drive to distribute to family members to view on a modern 4K TV or on their pc. If any of the family members have a Blu-ray player, you have the option of creating a BD or AVCHD to distribute to them in 1080/60p or 720/60p on disc or on a usb flash drive. The sharpness is better than what is on a DVD."
In summary, I want the highest resolution possible to play on my TV with resolution 4K 3840X2160. Your advice is much appreciated.