The things that are recommended are by no means the absolute only way of doing things, just the preferred way. If I were you I'd look into the proper pellets first, then culturing your own worms, then other food options last. I'd say a pellet diet can be supplemented by other things, one of which would be white cloud minnows, but you should talk to members that feed pellet based diets before making that decision.
Some members happen to feed pieces of tilapia or trout. That's a personal choice in feeding that I shouldn't recommend to a beginner, and I think you'd have to talk to the members that do feed pieces of fish about it rather than me.
Personally, I feed nightcrawlers and my own bred white cloud minnows, so I am not qualified to tell you all about fish fillets and pellets in detail.