First off, Russian, there is no resume you need to take to the OSO's office. You will during the course of your application have to fill out a length application, which the OSO will help you with. Taking a pre-resume, however, will not serve any purpose.
Secondly, Jafar's advice should be stricken from the record. An applicant has to tell the OSO if (s)he is interested in flying. You can get into a Marine Corps commissioning program as a 1) ground contract, 2) SNA contract, 3) SNFO contract, 4) law contract. So by not mentioning that you want to fly, you could apply for and possibly be accepted for a ground job.
If you're joining only because you want to fly, yes, you're making the wrong choice. If you want to be a Marine, then being able to fly is a nice byproduct. As far as keeping your air contract a secret, it's not a secret, if you try to hide it you only bring your character into question. At OCS we were required during inspections to say "Good time of day, sir/ma'am. Candidate Name, Some University, Air (or ground) contract" when the inspector stepped in front of us. Don't lie about it. At TBS you will have to fill out rosters and all manner of paperwork with your MOS on it. Student pilots have a different MOS from ground officers. You will have meetings for air contracts. Your SPC will want to talk to air contracts.
You got more questions, shoot. I've been in 11+ years. Went from enlisted to officer through MECEP. I'm in Pensacola now in training.