Some things I learned through pond building:
CHlroamine does not dissipate after a few hours like Chlorine used to and many cities use it these days. You need something that undo that chlorine and ammonia bonds to make tap water safe. Amquel is what I have used. Not all water conditionors work. I used a cheapie from walmart and it did not work which resulted in the death of some amphibian larva :(

Amphibians are 10000000x more sensitive to chemicals than what the average person thinks. Old buckets that housed chemicals, containers that have been washed with soaps, etc should not be used in conjuction with any amphibian related activities such as temp housing, carrying their water, etc.

Buy the best pond line you can get. I purchased one of those rubber (not pvc) kind and it came with a lifetime warranty. It doesn't cost that much more, you can have it shipped to your door, and you'll know it will last a long time. Most hardware stores also have hard plastic ones, I haven't used those but they look sturdy.

DOn't create deathtraps. The other day I saw a pond the had rock ledges sticking over the side of the pond and several inches between the water and the rocks. There is no way most animals are getting out once they get in. I created my pond with slopping edges and even if the water level went down while I am away I made sure nothing would get trapped inside there. I also created a ledge of plants which I think looks nice and added some potted lillies and leaf litter to increased the amount of hiding places.

I also landscaped the area surrounding the pond leaving only one opening to approach the pond. Mowing around a pond blows all kinds of crap into it and gives the inhabitats ni shoreline habitat. The baby frogs come out in masses and need plants to hide in as do the adults who often sit along the side of the pond.