As noted in my book (Chapter 34), the process of asking your dreams a question is called dream incubation. I usually recommend to people who they keep track of dreams and ask the same question for several nights and maybe up to a week. Over the course of a week, often the images that are produced may form a pattern that is helpful in discerning what the dreams are trying to convey.
The subconscious uses a strange kind of logic which I explained in my book. If your subconscious did a really good job, it many times is not recognizable what the dream is referring to. Keeping track of the dreams over the course of a week can give further information and illuminate what the images are trying to convey.
I recommend to people that on the first night they write the question they want to ask their subconscious three times to entrench the question in their subconscious. On subsequent nights you merely need to think the question to yourself internally before going to sleep. The most important thing, of course, is to write the dream the next morning no matter how fantastic or strange it may seem.
Using the rules in my book are likely to be helpful in interpreting the dream. It also often is helpful simply to tell another person the dream because having to put it in words may make some insights more obvious to you.
Ask your dreams questions at http://www.drstevenfox.com