I am seeking nomination from my congresswoman of my district, my two Ohio senators, and the Vice President. It was recommended to me that I send letters. What information should I additionally include other than just my intent to be nominated? Any tips? All help would be appreciated. Thank you.
Each nominating source has its own procedure, although many of those for members of Congress ("MOC") are very similar. Typically, one must write to their MOC to request an application, but some MOCs make theirs available online. IMO, a simple, brief, professional letter is all that is required. "I am writing to request an application for your nomination to the United States Naval Academy." Etc. I don't think that part is critical to your application, if a part of it at all.
If you mean letters of recommendation, I would again follow the prescribed procedure of each particular nominating source. The number and persons making the recommendation vary, but typically MOCs request 2 or 3, and sometimes require one from a math teacher, one from English, a third from anyone else, or something like that. You needn't submit them for the VP nomination. As I came to understand it (and I'm not an expert on the VP nom), the VP is, in practice, a discretionary nomination available to the Academy which uses the recommendations in the candidates USNA application in selecting the recipients. My DS did not have any letters submitted in support of his VP nomination (he ended up receiving a senator's nomination).
So, read your MOCs' websites for instructions. You should find out which staffer handles service academy noms and contact them (now), but it's better of course to be informed as much as you can when you do. Just introduce yourself, confirm the process and deadlines, and you're off to the races! Best of luck!