I have entry level SIMMS, beat the poop out of them. They leaked, after who knows how many years of torture, drunk falls and chili farts. They go to work with me and the harsh chemicals I work with, patched up and waterproof.
Unless you have the exact same rig and cast in the exact same spot, you are not guaranteed anything compared to the guy catching fish next to you. All this takes time and experience, keep plugging away, it will all fall into place. Focus in on one area and fish it to learn the ropes, leave jumping from spot to spot until you get a hang of things.
You have a current through the pond? How? Is there a creek that runs through it? Is it a lined pond or soft bottom like a lake? 5 feet deep? Pretty shallow, a harsh winter most likely will take everything out unless you run an aerator through the winter to keep it oxygenated.
Your pond isn't that big but you may have to supplement the feeding for the first couple years before anything stabilizes and becomes natural. My friend is building a 2 million gallon pond and will stock browns in it, he will spend 2 years just building an established forage base for the browns before he even attempts stocking it. Don't expect much reproduction with the minnows when you have 50 largies in there with them.
Do your research so you wont be disappointed with the outcome and/or angry with the costs involved undertaking such a project. Also, I would HIGHLY suggest you look into the legalities of such a project in your area.