I will echo the poster above. Also, there are many things you can do right now, like tomorrow, to check off a box that will need to be checked.
1) Go get a nice suit/dress and have a passport photo taken. You will likely need it for a nomination packet
2) Start working on a resume. In my area, both the Senators and the House rep require a resume as part of the packet. One says one-page only, the other doesn't specify. Have both ready.
3) Get your LOR's done for the nomination packets. Take your recommender a list with the address of each Senator/House rep. Check each Senator/House rep's website to see if they require a "form" in addition to/in lieu of a LOR. Take the forms and list of addresses to your recommender with the resume above (so the recommender has a full understanding of what all you are involved in). With word processing these days, the recommender can crank out three of the same letter with only the addressee being different. That way, you don't have to go back to them later for more letters.
4) Get copies of your high school six-semester transcript sent to the academy. Even if the official application isn't open, they will add it to your preliminary file and you won't have to send it later.