There are several books on dream interpretation. There are even some sites that will help you with this. both of these will give you a meaning for the symbols in the dream. This can be good but do not forget to take into account how you view the symbols of your dreams.
Keep a dream journal and record your dreams as soon as you wake up. This is difficult at first, with time you will remember more. Look for repeating patterns and think about what they mean to you.
I have a reoccurring dream that I am driving in my car and start to slide backwards. No matter what I do I keep sliding. I can't get out of the car and I can't stop it. I have come to realize that this dream occurs when my anxiety level is very high. I have to find what is causing me anxiety and fix it before the dream stops.