How much fish food should I add to a 500 gallon pond with a dozen goldfish and 20 frogs?

This is all new to me. I put in a bubbling stone and I have a filler line above the water running at about 1 gallon per hour to keep the pond level constant. It is a small stream 0.014”, 0.3mm, in diameter, running at 50 psi so it injects air into the water as well.
I took a couple of scoops of duckweed and lily pads from a neighborhood pond and threw that in. They seem to be thriving even though the pond is in the woods.
Over the past 2 weeks small frogs have been appearing. Great! There are about 15 or 20 now.
I decided to add some fish so I went to the pet store and bought “feeder fish” or “carnival fish”. They came in two sizes. I splurged and bought the larger size: 1”, 25mm, for $0.28 per fish.
“Give me $3.00 worth, my good man,” said the big timer. I figure there are about a dozen.
I just bought some TetraFin Goldfish Flakes and ReptoMin Floating Food Sticks for turtles and frogs but have no idea how much the critters need.
The instruction say to put in enough so the fish can eat it in a few minutes. I don’t see the fish.
The frog food instructions are about the same but the frogs jump into the water when I approach. I don’t see them eating either.
How much food should I put into the pond to keep everybody happy?