Digital Content

Hi everyone,
I'm setting up a new Digital Library for my trainees in my company, which is a call center where English is NOT the primary language for 98% of the employees. I need some suggestions on what I can include in this digital library that I want to set up. Please advise as if I were a newbie as I was starting from top to bottom. Subjects such as where can I store it; how can I separate the topics, etc. Also, if anyone could suggest some good reference materials such as books, TED talks, business journal subscriptions, forums (obviously this one!) and any other possible ideas that I can include in this Digital Library that I want to set up! I also recently ran a survey and the subjects my trainees would like to learn about is "Leadership" and "Mentoring" and the media they like is "Interactive Learning" and "Video".

I'm looking forward to your responses,