Help me with my chest exercises?

I'm currently 5'10, about 158lbs, and 17 years old. I'm trying to just bulk up right now. I do chest excercises once a week, as with every other muscle group. I'm keeping my chest sets between 7-9 sets total. 3 sets flat bench, 3 sets incline, and for the last few sets, I've not been sure what to do. I was thinking one arm dumbell bench? I've noticed that i can't do as much weight with that as I can with regular bench, so am I fine to stick with 3 flat bench, 3 incline bench, and then 2-3 one arm bench, or should I just do some decline benchpress? (I've heard decline is useless but I don't know how correct that person was.)
 
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