I've studied Digital Media, but now I work as an in-house designer, so I'm also creating brochures, postcards etc.

So far creating print-ready files hasn't been a problem, but now I'm working on Christmas cards that will have a metallic effect and stuff and I'm a bit worried cause I'm not sure if I know enough about printing to do that.

Thus now I'm looking for some beginner's guides to printing (knock-out, overprint, huh?). ^^ Tips anyone?