My MOS (12R) is overstrengthed and the army is gonna give it the axe, who can help with advice?

You will have until your MOS is officially phased out or until you volunteer for a Reclass. You can't be reclassed until you've had a year on station, as per AR 614-200 and other policies. If you don't initiate a Reclass before the Army does then you will receive a DA directed Reclass.
When you receive your class seat you will attend in a TDY enroute status (unless you attend a PCS length school 23 weeks or longer). You are usually separated from initial entry recruits, although this varies from post to post. Typically the punishment for fraternizing with IET students is UCMJ or court martial, again depending on what AIT you attend and other factors. You will attend in a TDY enroute status, but usually you will attend the school and then return to your duty station to clear before PCS. High likelihood of going to Korea.
As for the MOS's, don't look for one that is "marketable on the outside". People are marketable, MOS's are not. Having watched thousands of Soldiers transition, 99% don't do what they did in the Army. Most of the ones who did a job that has a civilian equivalent never get the certifications to do it in the civian sector, or get burned out doing it.
Figure out where you want to be in the long term, then work backwards from that end goal. Figure out how much of that the Army can help accomplish and plan your exit strategy accordingly. People usually do the opposite and look for stepping stones. For instance, I'll go to 68C and become an LPN which opens the door to RN or PA. But realistically, they could finish the prerequisites for RN or PA Program, be accepted, and start school long before they would finish 68C AIT or work in the job long enough to move on.
Look at the end goal and work backwards. Feel free to contact me if you need help once you identify your goal.

Contact your local SORB office. ARSOF has some of the best conversion to civilian sector training! Goarmysof.com

For starters, what ever MOS you end up going to, you will be considered a Prior Service Student at that AIT. Now for the other things. As for your family, this will (probably) depend on your orders. What ever orders your get, ensure you read them carefully and read every sentence to the period. They will spell out what will need to happen (what you can and can't take, etc.). As for an MOS with a marketable skill on the outside, I hear Sat Comms is pretty good. But, regardless, get with your Retention NCO/Career Counselor and carefully weigh your options and choices. Good luck.