Maybe some members here will disagree with me on my method', but a large part of photography (IMO the most overlooked by beginners) is white balance. To better develop your white balance, try shooting for a while in RAW - your files will be roughly 3x the size of jpeg and need to be converted before loading to like 99% of places, including print labs - when you load the images to the computer open up the photo editor that came with your computer and find the white balance adjustment -- then just play around with the preset adjustments on different photos, and then if you get good with that try doing the custom adjustment.. Doing this will help you develop a sense of what to use for white balance where, and what your personal preferences are.
I know that the white balance presets seem easy to determine, but I know that lots of people will do things like use the 'cloudy' preset to warm their images (Bring out the warm colors better, like orange, red, yellow)