If you are not familiar with image processing programs in general, learn how to use a levels adjustment layer, should be the first thing you use once you develop the raw image. Learn how to open each channel (Red, Green and blue) and colour balance an image. Next thing is the curves tool and how to use an "S" curve. You should find tutorials quite easily with google. Finding one that tells you how to use levels to quickly and accurately colour balance an image is harder. This one:
Using Levels in Photoshop to Image Correct Color and Contrast is for photoshop but the principle is exactly the same. This method can remove the green cast from an image taken in green water, something that setting colour temperature alone can struggle with.