Well since I really don't know what I am doing, I asked those questions just to make myself sound smart.
With answers to those questions, you can fine tune the presentation. If you're fishing in unproductive waters then all you are doing is practicing your casting and you are not learning anything about your lure presentation. The more information in the question, the more accurate the answers will be.
Bluebasser86 has it right. Dark waters = Dark Colors and usually larger size or moving tail. Clear water = light colors and usually smaller size.