Wedding Planners

Now that I am engaged and starting to think about the wedding I know that it will be difficult to create my dream wedding on my own while working full time and trying not to become a bridezilla. We don't have a huge budget but I definitely want a planner/coordinator to be a part of that budget. So I have a few questions. I hope you all can help.

How do I go about finding one? What would be considered average cost vs over the top? Any other tips, hints or tidbits you can offer?