0317 is a secondary MOS and so is 0326 so that means that you have to have a qualifying primary MOS first.
Recon Marine would be your primary MOS (0321).
0326 is a Reconnaissance Marine Parachute and Combat Diver which requires that you be an 0321 first and then go to jump school and Combat Diver school.
0317, Scout Sniper is another secondary MOS and you'd have to attend Scout Sniper school.
Recon Marines are volunteers and they usually come from an infantry MOS (other MOSs can volunteer for the job but most don't make it) and you have to be released from your primary MOS. That means that you have finished boot camp and your primary MOS is in the combat arms group (infantry, armor, heavy weapons, etc.). All of these schools you're talking about take time. From the time you enter boot camp to the time that you get your primary MOS you'll spend about a year or so. Then you have to volunteer for and pass the Recon screening. Then you go through training for your Recon MOS and that'll be a few more months. Then you will have to request the schools for each of the secondary MOSs that you want but you can only apply for a school that trains you for what your unit needs. If they don't need a Scout Sniper then they wont let you apply for the school. The schools themselves have only so many slots for students and if there are more applicants than openings then the school wont take you. Then you have to pass the initial inventory tests that the schools have and if you fail them then you return to your unit and they are less apt to send you for that training again. Even if you were to get approved for every school that you want and you finished each school successfully, it will take more time than you will have in your first enlistment so expect to enlist for at least two tours to get everything that you are planning to attain.
I retired from the Marine Corps before you were born and spent a little over three years as a Recruiter so I am familiar with how the Marine Corps works.
P.S. There's a lot of ugly that goes with being in Recon or worse yet, Force Recon. I suspect that you're all full of youthful enthusiasm for being a bona fide badass but there isn't much glory when you're hot, dehydrated, hungry, scared, and you still have to hump miles of mountain terrain through bad guy country with 80 pounds on your back before you can get to someplace safe.