In my completely anecdotal and unscientific opinion as a former wrestler, neck bridge work was done to be able to support your own bodyweight as well as that of another person who was trying to pin your shoulders to the mat. However, we only did bodyweight and drill work. No actual weights involved.
Regarding range of motion, during warm-ups, we'd try to get our noses to touch the ground, using our hands as support as needed. Regarding strength, it was just a daily part of practice, so frequency is key since you don't want to risk injury with overloading. Just make sure to practice front bridges as well as back bridges to maintain balance.
A good drill for this is something we called bridge flips where you start in a back bridge, reach over your head to grab a (standing) partner's ankles (arm's length away, so straight arms), and bounce back and forth (using leg and core strength) between front and back bridges (in the front position, your legs go to one side of the standing person or straddle the legs). We also did hip heists where you move from front to back to front bridges by cutting your hips and leaving your head in contact with the ground.
I wouldn't recommend an external load until you've spent a few months on bodyweight work. Just my two cents.
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