Snail on Red Flower
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This photo was taken in March 2015 with a Canon 5D MkIII, TAMRON SP 90mm F/2.8 Di VC USD Macro and an external flash with a small softbox
Camera Settings: f/18.0, 1/160 seconds and ISO 100
Now focusing is probably the hardest part. Unless you have a Lytro camera with which you can refocus in post production. Auto focus usually does not work with macro photography especially if the scene is dark and/or you are darn close to the subject. I advise immediately switching to manual focus.