As to the forums, most guys have no clue they are here till we point them in that direction. Some don't find them for months.
If you really want to help pop into the TA when there are 10 or so in there.
Field a few questions, do some 1 on 1, etc. Just remember to read & follow rules, set a good example.
CCVI currently we have about 7 active trainers.
As to how many hours, thats a good question. It varies considerably depending on the individuals involved & the #'s in the TA. At peak I've been known to average 1 to 3 hours a day in there when demand is high.
On Emails, its been fairly slow, I ussually get 1 or 2 a week to my priv email plus one or more a week on the trainers email.