Right after I got engaged someone gave me a copy of a book called 'The Knot book of wedding lists' and it helped me so much to get the ball rolling.
I had no clue how to start making decisions or when I should have been making them and this book goes through everything step by step by asking the reader questions so they can get an idea of what they want. The lists are awesome because they are broken down by time period such as what should be done 12 months before, 6 months before, etc.
This is the book: http://www.amazon.com/Knot-Book-Wedding-Lists/dp/0307341933/ref=asap_bc?ie=UTF8