Well the first thing I would think about is save the dates (if you wanted done that already!) - My recommendation would be to send those out sooner than later to give people plenty of time.
In terms of flowers, food, music, etc. those are things you can start thinking about and getting ideas from here and from the net and other sites - if you find things you like you can email the WC and ask for pricing on things. YOu can also start thinking about things like OOT bags, etc.
We are getting married end of November. Once we had our date and time confirmed, we sent out our save the dates to our guests. So far we have bought my dress and been bridesmaid dress shopping. I have also been emailing with the WC re: menus, flowers etc.
Another aspect you may want to consider is photography given that photogs book up early. Think about whether you want to bring someone down with you or hire someone down there and talk the the resort (or other BDW) to find out about outside vendor fees.
Hope this helps - I totally understand how you feel - better to get as many things done earlier than later!