As a newcomer myself i would think this is a great idea. Altough i don't think whitelisting is the way to go since i would like to beleive that people know themself enough to realize that playing a slot they know they won't be able to handle isn't that great of an idea.
But like ryko and smiley said more general traning in tactics, comms and weapons i do think would help out people who are not used to playing at this level of seriousness or just are new to the mods.
Aslong as the the training instructor(s) know what they are talking about. This might just turn out pretty well.