To begin with the choice of colors would top the list. So what family of colors is on your mane wish list? Are you looking to alter the color or color the gray?
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: