Here are my thoughts on the things that are unique to the digital world....
Set the white balance according to the type of lighting you have on the subject. Make your best guess or use the procedures for Custom White Balance. I have found, through experience, that the AWB (Automatic White Balance) is wrong more than it is right - at least in non-standard lighting situations.
I suggest that you shoot everything in RAW file mode. Add a .JPG format if you like. I shoot RAW+Large JPG. The RAW file has no compression, and thus is better than a .JPG any day of the week. .JPG files are compressed, and even the best loses some information. In addition, when you convert from RAW to a format for editing or printing (.TIF or .PSC are the most common) you have the option of selecting white balance in the very same way as doing it on the camera. That is something you cannot do with a .JPG file.
Keep your ISO settings as low as you can for the best quality. That's the same as selecting slower films for less grain, etc.
Think about using the camera more in manual control modes than in the fully automatic modes. You will be able to make better images that way. I, and many others, never use the "picture" exposure modes. The "P" mode is the closest I will ever get to full automation, and that is used very seldom. Setting the Custom Function 4 to "1" changes the function of the * button to become a trigger for auto focus. By using that, I touch the * button when I want the camera to change focus (and I am too lazy to twist the lens ring). At no other time will autofocus work.