Here are some things that that I learned early on and have served me well concerning night approaches
1. Keep your head on a swivel. you must scan to overcome the central night vision blind spot and most of the visual illusions
2. Treat all visual barriers as physical. I the lights on your LZ disappear there is something between you and the LZ.
3. On final limit your rate of descent to 300 fpm or less and your airspeed at or slightly above ETL. (settling)
4. Landing lights are useless above 200' AGL don't turn them on until then and leave them on when you do. They ruin your night vison.
5. Going to an unlit LZ without a serchlight you will be able to detect light at 25 ft and motion at about 15 ft using only the position lights. There is a tendency to drift to the right because of the brighter green light on that side.
6. There is a lag in the radar altimeter.