J Smithers

I'm just getting into painting and I'm already addicted to it. However, I really don't have a clue as to what I'm doing. I went to hobby lobby and bought several paints and just started experimenting. My main question is this, with the createx paints, do you have to use a reducer? I've been putting a little bit of reducer in with my paints but I just don't have an understanding as to what it actually does and how much I need to use. I just don't know if I'm using too much, too little or if I should even be using it at all. Thanks for the help!