You said the very key to a lot of what this is about "Confidence"!
There are literally thousands of bait types, combinations, colors, and sizes on the market. Finding the right one can be a daunting task. One that many people simply don't want to take up simply because of the gigantic expenses they associate with purchasing all the different color combinations under the rainbow.
People will tell you "I only use this color" or "I only use this bait". Maybe because they have "confidence" in that bait. Maybe because the lake they fish, that is all they need.
Not all lakes are equal. In one lake, I kill the crappies on an orange twister body and Chartreuse tail. A lake two minutes down the road, they won't touch that color but will destroy a "parrot" color. Another lake, they like "tractor green". The take away from that is the clarity of water in relation to what the fish see. In other words, it does help to have a variety of baits to be able to find exactly what works best for that body of water.
I've been in a similar situation. I started with a hand full of core colors and went from there. I cannot say what would work best for you but I would say a selection of packages of different core colors would be where to start. Everyone has their favorites and some are region specific. For me, I like the "Big Bite" company and really like their twister style tails in a variety of colors. Pink and White, chartreuse and orange, blue and chartrues... (you start to see the "core" colors I am talking about) are all good starters.
As I said, some colors don't always work best in every lake or situation. One bait I have found that has worked for my in a variety of lakes and situations has been the Big Bite "Shad" in the standard gray and black 2 inch variety. We use them so much that I purchase them in bags of 50! The rest are in packs of 8 or 10 for around 1.25 or so (depending on where you get them).
Don't go hog wild and break the bank on buying 100's of colors as the project of selecting a color when you reach the water can and will be overwhelming! Select a few colors, try them out and see what happens. Casting deep to shallow can be great (like bank fishing). Slow lift retrieve, popping, twitching and retrieving, all can work at different times. Sometimes it is more about cadance than the bait.
I could write on and on about it all but that would be what I would recommend to get started.
I have OCD "Obsessive Crappie Disorder"