You already received some good advice.
A couple more:
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Read the K-x Instruction Manual.
There is little point to buy a book and to benefit from it unless you know how to use your camera.
The Instruction manual is not always the most user friendly, but there are plenty of good information for your camera.
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Use your camera and experiment.
You will learn a lot by taking some shots and checking them later in your computer with a PP software (Element, PDCU, .....).
Also experiment with your camera. Try different things. Go outside of your confort zone.
Last year, it took me nearly 6 weeks to learn how to use my K-7, and I continue to learn 18 month later. Nothing wrong with that....
Hope that the comments will assist, and post some shots.