What can i use to fix spots where iv had acne on my face?

i get acne n blackheads real bad. especially wen we get our monthly visit. i hav a bad habit of pickn at my face wen i do. wats the best cleanser 2 use? also where iv done ths my face looks bad. u can tell iv had a bad acne problem n piked at it. what can i do 2 mak my face look smoother n better? what about bumps on my back and shoulders? i need somethin reasonably priced.