First, congratulations for several readily apparent reasons including looking in a great direction for your future and none too soon nor late. And it's obvious that you are a stellar young man who comes from good stock and with parents who care enough to help you in your preparation for this next step and specifically in your research about what it takes to be competitive for an appointment to the United States Naval Academy. Well done.
Now to your question, there are several websites that will aid your search, helping to address any and every question you may have, if not always able to provide clear-cut answers. There are many people who can and will help you, in fact one of THE most helpful fraternal "families" you'll find anywhere.
Here is the basic USNA site. Begin to review and study it, especially the "Admissions" tab on the left side of the screen. Make sure you look carefully at the most recent class profile posted. It does not hold specific answer for any candidate, but it provides a general picture of all those who have accepted appointments in the most recent admission season. For example, you see that 90% participate in scholastic athletics. You can already put a "check" in that column. And obviously in a number of the other primary characteristics that the Academy chooses to advocate and publicize. There are others, as well. One quick word: Don't get into the "game" of trying to get all the characteristics "checked" off or maximized. That is rarely a productive strategy. Neither should it be avoided, however, especially being only a sophomore. In other words, begin to identify and pursue meaningful, genuine service opportunities in which you can grow, contribute, lead, and flourish. Don't play 5 sports if they are not of real interest and passion. You get it, no doubt.
Remember this ... the application, nomination, and appointment processes are NOT often analogous with application to secular institutions. You will be competing initially with both local Congressional district competition, which can and often does change dramatically from year to year. One year might find two or three Rhodes Scholars-in-training and the next year a much lesser pool. Same will be true altho to a lesser degree, at state levels.
You ask about Ohio. The short answer is I'm not sure about competitiveness. I do know it's less competitive generally than MD, VA, FL, TX, CA, PA, NY and any number of other highly competitive states, but it is still very competitive. Do not over-estimate the "value" of being in a Midwestern State, especially in this time of economic distress. Many more are looking for ways to get an education that is "affordable" if not free. And an SA education comes at a very high, deferred price.
Be cautious about embracing the mean statistics, especially if you're not a minority priority target. Since focused recruiting has commenced in key urban areas in order to fulfill the mandate for more minority Midshipmen, the candidate "applications" have sky-rocketed while the mean stats in some areas have gone down. Many try to ignore this reality but it is reality. What might be concluded is there are really two sets of "average" and the non-minority target is notably more stringent. Conversely if you are a priority minority, that will be to your advantage relative to the general data that you will see.
So, that may be enough for now. Check out these two sites and bon chance. A personal suggestion of for a "next step" might be to begin to identify what needs doing, the kind of things that get measured, and have your son set up a matrix/chart that he can add to and note completion/fulfillment of steps. And start reading books about USN and USNA. I and others can help with suggestions. Here's a "must get" at your early convenience ... and there are always good used copies on Amazon and the bargain sites.
"The Naval Academy Candidate Handbook" by Sue Ross This will really lend alot of basic guidance of the process.
The Academy site ...
http://www.usna.edu/homepage.php
Here's another great site ...
http://talk.collegeconfidential.com/naval-academy-annapolis/1387700-seeking-information.html
Lastly, I started to offer earlier ... remember that it is statiscally FAR MORE competitive in gaining an appointment than graduating and receiving a commission. And they are both very demanding, lots of work. Now is a great time to get started. Lastly, if you are people of faith, seek your God's blessing, guidance, and assistance. Pray hard and often. This requires more than being "great" as a candidate. A great many are. Best wishes and good luck. Up up away!
And here's link to book noted ...
http://www.amazon.com/The-Naval-Aca...92297&sr=8-1&keywords=sue+ross+the+candidates