Hey Congrats!
-The road to your base will be through IFS, Water Survival Training, SERE, and of course primary CSO training at Pensacola. While I was there at Pensacola, training was about a year long and consisted of typical AF style flight training - a round of academics on your plane/systems and then several phases of flights. You'll get time in T-6s and T-1s and a pretty quality simulator running missions that will have you learning quite a broad range of jobs a CSO may do in the AF. At least at the time I went through even the guard guys who knew they would be Herc-folk still had to train up on how to drop bombs, jam/suppress threats, run basic air-to-air radar and fire AMRAAMs in addition to basic Herc-nav stuff like low-levels, IFR mission planning and execution, and countermeasures deployment.
Honestly, as far as preparation goes, I'd say just enjoy your time before you get there, it was pretty busy for most of us once class started. The one thing I think helps alot of people out is to invest in a few hours of flight instruction. If you get some ground-school and basic airmanship in, it will go a long way in making sure you don't start out struggling.