Well, recently, when me and my band I'm getting together would **** around/practice songs I would occasionally sing(mainly growling and screaming). So, it has been decided that I'm damn good and am going to get a vocal rig. What the heck does one of these encompass? Before I was just plugging this ****ty mic i found into my guitar amp and turning it to a clean channel with no effects and all my settings in the middle. So, what are you actually supposed to do for vocals?

*EDIT: I wasn't sure where to put this, but I figured some of you guys would know.