Good idea to plan ahead on that one. Fortunately you have DME which makes things easy. What is the DME at the threashold? Use that as your reference. For example, the threshold is at 1.5 DME with DME distance decreasing as you get closer to the runway. Minimums are 600 feet AAE. Start your descent at 2miles from the threshold(3.5 DME).
What rate of descent. Based on approximate groundspeed. 140 knots for the final descent add one zero and divide by two which equals 700 fpm. Once close in you can figure it out visually. Take into account significant runway slope, runway width differences and rain on the windshield.
Used to go into short ice strips in the arctic at night. Total black hole places. No papis. We had the threshold coodinates in as the destination on the GPS which was also used for tracking. Would level off at 1500 feet about 10 miles back and configure. At five miles back, final flaps and descent was started. 7-800 fpm usually works. Prior to descent I would mark down the desired altitudes for the last 4 miles. If I was PNF, I would read out the each mile and desired altitude. "4 miles back, 1200 feet". The PF would then know if that if he was at 1150 feet, we were a bit low and could adjust. At each decreasing mile the desired altitude was given. Worked well.
Worst place visually was a night landing at one place that had the first half of the strip with dim lights and the second half with bright lights(remember, these are temporary generator powered lights). It really caused a problem when you discovered that you had been aiming for the second half of the strip when the first half runway lights finally came into view.
One time we had to leave a strip with no lights. Got a groundcrew guy on a skidoo to lay out several rolls of diesel soaked toilet paper rolls and then light them up just as we were ready to roll. It worked.