Do you understand depth of field and how aperture affects it? What shutter speeds do to a picture? If so, then you've got a decent enough background to start off without lessons. Actually, one time I handed my hubby my camera, told him how to turn it on and let him snap sunset shots while we inched along (I was driving) in the backup behind a partial road closure due to a brush fire. He did really well and then later used my DS at Yosemite without problems. This is a guy who has never owned a camera in his life, and has no interest in learning anything about photography.
I'd love to take a photography course somewhere and don't want to talk you out of lessons, but you might not need them - the K100 can be an easy camera to use right off. Read the manual a couple of times. It's good at explaining the "what" but not necessarily the "why." And we're always around here to answer questions.