I use an online service for all my printing. I use Photoshop Elements 2 as my image editor. I can do some basics (brightness, contrast, saturation, fix red eye, unsharpen mask). In the books I have been reading about Photoshop, I have run into the terms resolution, dpi, ppi, resize, etc and am getting confused. After I finish editing in elements I save my file as a jpeg (I shoot only jpegs) with a quality of 12, maximum and I use the baseline standard format, then I upload to a printing service and order my prints. My confusion has to do with the image resize choice in elements. I want to get the best quality prints that I can, should I change the default 72 ppi to say, 300 ppi. Does that improve my image for printing?
My current workflow is: crop to print dimensions that I want (usually 4x6),clean upimage, save as a new name in highest quality, upload and order prints. Anything I am missing?