Well welcome again ryry!
I don't know what school will be like exactly but its 26 weeks/½ a year long plus any time waiting to "class up" will put you at between 6-12 months total time there (I'd say around 8-9)
You can be stationed anywhere--CTMs are still "true sailors" in that they can, and is normal for them to, be stationed aboard ships and submarines (CTNs can but nowhere near as likely).
I saw two youtube videos from a CTM, one was him on some sort of Thanksgiving Leave during boot camp and the second (two videos about the Navy that is) is him 3 years later and he said he is liking the Navy, he loves being a CTM, and that the Navy has been good to him. I think he said he was at Fort Meade for his first two years (where he said he also had been to Afghanistan, Djibouti, Germany, Qatar, etc) and that he just received orders to a ship (I think USS Port Royal, a cruiser, if I remember correctly). I think he also said he signed on for two extra years for a "C" School and that he would enlist again.
Here is the second video:
http://www.youtube.com/watch?v=JftgamIxNXU
I think I signed as a CTM because of the credentials I already have and my two certifications are listed on the COOL website's CTM page:
https://www.cool.navy.mil/enlisted/ctm.htm
And the A+ certification is about local computer repair and basic networking. The Network+ is about the fundamentals of networking, but way more in depth than A+, like the OSI model, TCP/IP suite, network management, LAN/WAN topologies, networking mediums, network security, etc.
Rating Card your Liaison should have given you:
https://www.cool.navy.mil/enlisted/r..._cards/ctm.pdf
I ship out next month and will be in Pensacola some time late January/early February and I will definitely keep you updated on and as a CTM--I know there weren't that many CTMs when I signed up as I think its one of the smallest, if not the smallest, ratings in the Navy.
Congratulations again!
Ryan
P.S. Is Your name Ryan by any chance? lol