There are propane chapters in some "Care and Feeding of an RV" books. That is about all there is because that is all there is to it.
It works like this, get:
A cheap yard stick
a length (6') of small (1/4~3/8) clear plastic tubing
some rubber bands
Use the rubber band to make a loop of the tubing on the yardstick and put some water in the tubing. You just built a manometer (device to measure low pressures).
Turn the gas on.
Take out a stove burner and push the tubing on a jet.
Turn the burner on.
The water in the manometer should shift so there is now about 11" difference between the two sides (that is why you used a yard stick).
Turn of the gas at the tank and wait. (A day is not too long.)
There should still be 11" there. If there is - Great...
It there isn't, you have a leak.
To find a leak, do not use window cleaner or and prepared cleaner, use dish soap or kids bubble stuff and spray or paint it anyplace you can find. Where it bubbles......
As to the kinks. unless it is nearly kinked shut, it probably won't matter. If you can replace that piece of line, that is good. They are just flare connections (No Rocket Science here). You can also cut out and replace just the damaged part. Inspect per above when done.
A lifelong waterman and his bride going dry places for as long as the fuel money lasts.