Fishing for sunfish, bluegill, bass, and crappie

[Drop the Bass]

If I were to try to catch either one of the four... sunfish, bluegill, bass, or crappie... would I use a bobber? I'm going to be using worms. I usually put a weight about 6"-1' above the hook. So should I be using a bobber? Would I get better results on a bobber or without a bober?

Thanks.