Janice, I do experiment with the exposures. Sunsets can be tricky for your camera's meter, so bracketing is a good idea.
I don't worry about white balance at all though. I shoot in RAW.
A raw file (NEF in Nikon, CRW in Canon) is just that, raw data. It records what the sensor recorded. The camera creates a JPG preview image but the raw file itself is untouched. The white balance setting is noted, but no changes are made to the file.
You can often see this in Adobe Lightroom where the JPG image shows for an instant while it renders the raw file. Then you see colors change, sometimes subtly, sometimes dramatically, as it renders the raw file. LR uses the "as shot" white balance for the render, but you can easily change it. So I pick an approximate white balance in the field, or if I'm feeling lazy, just use the auto WB. That allows me to get a decent preview on the LCD screen.