You create an HDR photo first by finding a location where there is minimal movement as possible, make sure you have a tripod to make sure your image is the exact same every time you take one of the seven photos you'll be taking at each different exposure, then set your exposure compensation to negative three then move to negative two then to negative one then to zero then one then two then three, after you have completed those steps get to a computer import your photos to the computer, then open photoshop, , go to file > automate > Merge to HDR , now select your seven photos from each exposure and make sure align photos is on then click ok. now you can choose what you want to make your HDR photo what you want.
The thought process that happens before I take my HDR photos is, well first for my landscape I look at the potential shot I say is it "HDR worthy" , "Will it look good when I edit it" and "how will I position this shot ." Then I take the photos and if they turn out really good i'm done but if not i'll take another set of photos from a different angle and same goes for the experiment photo. When i'm editing I pick and choose the settings that i think look surreal. I really like doing HDR photos and editing them , I will definitely use these way more often now that I know how.