Congrats on getting "the call". However, I wouldn't be expecting another call too quickly. From the guys I know in the 18 Nov class, most received their initial hiring call in the May/Jun time frame. There is a pool of 85 people presently... 24 of them will be in the 18 Nov class. I don't know where exactly you fall... but figure it is somewhere between #85 and # 24. (not a lot of help on that part).
If more training classes begin in Jan...and you are in that class... expect a call one month prior (Dec).
Good luck,
Kav