Make sure you use pressure treated wood or coat the thing with water sealer. The frogs just love to hide under it. So does one of the filters for the stream and lower pond. Se ior Frog is a resident of the 'Pond Down Yonder'. Our friend Honey Bunny loves to eat the bird food that hits the ground.
Ponds take time.
Don't rush it. Give the pond time to adjust. Let your pond turn green, it's a natural process. Don't drain it and fill it with fresh water, that will just turn green again. Give it a week or two after you put plants in before you introduce fish.