Hey girl! Dont freak out! Your letting yourself get overwhelmed and that is not the point of a DW.
Your first step would be to research and pick a resort. There are Travel agents on here that can help you. (ex. TA Jennifer, TA Maureen)
Once you do that I think you should pick a definite date and send out Save the dates. To let everyone know of your plans and to give them notice to start saving. I would also make a website for family and friends to visit and you can update with any and all information about the resort, location, and your wedding. Once those first two steps are done everything else will fall into place. You have quite a bit of time so dont stress out.
The third most important step would be to pick a photographer and book them so you know they are yours for your special day.
You will find tons of helpful and useful information on BDW and everyone is here to help.