When you are just starting out I wouldn't worry too much about processing and PS effects, messing with the colour channels etc. Concentrate on taking good photos, think about the subject, the composition, the framing, leading lines, balance, contrast, arrangement of elements, lighting, time of day, exposure, depth of focus, shutter speed, sharpness, capturing motion (or preventing motion blur).
When you have a good understanding and grasp of all of these aspects of photography then you can start seriously delving into the processing side. Remember, you should always start your processing with the highest possible quality of base photo, and that no matter how good your processing is you cannot change certain aspects of the photo. If you took the photo at midday with poor lighting then it wont look as good as 3 minutes after sunrise, no matter how much time you spend in photo shop. If the composition is wrong then beyond a little cropping the photo will always have poor composition.
Secondly, you have chosen a lot of B&W/sepia styles. This is normally an indicator of a beginner photographer that is trying to improve a bad photo. Most great B&W photos are already great colour photos that can stand by themselves as a colour photo. IF the photographer chooses to process in B&W then then they must think carefully why, for what purpose. You are throwing away a lot of useful information in the colour channels, you need a reason to do so. Typically this is so you can enhance other aspects of the photo, bring to the attention of the viewer things like texture, contrast or composition.
Furthermore, a good B&W photo was always destined to be a B&W photo before the shutter was pressed. The photographer upon careful examination of the scene decided that a black and white treatment would be best due to textural or compositional elements. Exposure and composition are chosen for B&W processing in mind. The colour RAW is still going to be great mind.
Lastly, if you are going to make some B&W photos and things you should be consistent with the style across the set. You the same B&W or sepia tones across all photos, don't mix and match within a set.