The second stop on the internet is an Expert's page....most likely to be on lifestyle web sites which tell the ground rules of which skin types goes with which hair color etc. Don't bother to read too many of these as each one of them is likely to have their own version of hair color palette! Once you have short_listed a range of hair color options, try looking for pictures of people with similar coloring and how they would look in it. Many salons have sophisticated software which helps conjure up an image of you with the hair color and it might be worth the money you spend on it.
Hair color ideas are not stand alone thoughts and need to be combined with your skin tone and personality to give you the right match. Never copy someone else's hair color idea blindly as it just might be completely wrong for you. If you are coloring your hair for the first time, you can seek professional help at the salon. Otherwise, the internet is a good place to start with as well: