You have been shooting for about a week. Spend a little more time on that and a little less time on the Post Processing. They are all edited very badly. I do not say this to be mean, but its true. Plus, they aren't great to begin with. The first one could have been good if the boring barrels didn't ruin your shot. If you had just shown off the lake and the cool looking sky ( and had a better exposure ) it could have worked without processing it more like #2 and #3. The main problem I notice is your composition. Do some studying on that topic. Do not let what I say discourage you, let it inspire you to learn more. We all started where you are right now.
With that said, your main question was on the topic of the post processing, and like I said, its overdone. Less is more. Learn the basics like contrast, color/levels, sharpening. Master the basics before attempting to go into heavy manipulation because frankly those basic things are what will ruin a pic most easily and most often in my opinion. So without them being done well, everything else you do to the pic falls apart.