To be a CI you have to be over 18 years,and to work with cadets unsupervised, you have to be CRB (Criminal Records Bureau) cleared. ie Proven not to be a kiddy fiddler. which takes several months to come through.
The ratio of CI to uniformed staff is generally unbalanced and after a period of probation, you will probably be "encouraged" to wear a uniform either as VR(T) [officer] or adult Sgt which is not VR(T).
Attitudes and performance by various Sqns can be VERY differant. So if your first Sqn is a poor one, please do not tar the organisation as a whole with the same brush.
Although politics across the Corps is generally pathetic, and "Share rescources" with other ATC - Army and Sea Cadets appears to be a rude word.