Hello!
Snipping Tool offers settings that should make this super easy for you. If you open snipping tool, and navigate to Settings (Top right), there is an option that will Add border to each screenshot, another option for Ask to save edited screenshots, and an option that with Automatically copy changes, which copies any changes made to a screenshot straight to the clipboard. If you close the Snipping Tool window after you're done editing, it'll automatically save to your Pictures library.
Hope this helps!