Browse Nominations forum here on SAF. Read Stickies at the top.
Read every page, dropdown and link on usna.edu and usafa.edu, paying particular attention to Admissions and Nominations info. Most questions are answered there.
Figure out what Nominations you are eligible for.
All elected representatives have a website. Using a common sense approach to your google search string, try "Senator/Representative (Name) Service Academy Nominations." If the MOC has SA info sessions, attend them. Read all the related web pages. Do what it says. They don't all do it the same way.
The application process itself is part of the weeding-out process. Demonstrating initiative to do detailed research using primary sources, paying attention to detail, providing complete info in required format, paying attention to detail, meeting all deadlines - critical to the year ahead. I used "paying attention to detail" twice with intent.
Treat it like a school course that has required reading, assignments, tests and essay questions. Organize your info, action steps, progress and timeline in a way that works for you. Keep copies of everything you submit!
Here is a sample web page for a congressional representative's FAQ page for nominations. Each rep may differ slightly, but generally it is pretty consistent in terms of timing, the interview process, etc.
Like nina1234, I'm applying to USNA and USAFA. I know it's most likely irrational, but I have the fear that by applying to two academies, I'm looking like I just want the free education and don't care about the branch I would be serving in. Does anyone agree or am I just overthinking this?