A good habit you can get into now is NEVER changing the white balance setting on your camera, you can change it AFTER you take the photo as long as you are shooting in RAW. Set your camera to AWB, and leave it there....forever.This may not work, from a workflow perspective, for a wedding photographer for instance:
A typical job may result in around 800 images. The closer those images are to perfect, straight out of the camera, the less work you have afterwards. - After all, your client does not pay you for the time you spend editing in Lightroom/Aperture/DPP etc.
As for shooting JPGs - I can understand why some wedding photographers shoot JPGs, but my wife and I do not subscribe to their point of view. (They probably don't have UDMA CF cards, and have not realised that storage is cheap.)
If you have a 1D/1Ds, then it makes absolute sense to write RAW to CF and JPG to SD. That way you have a level of backup in the event of a card failure.