There are many things to think about when designing an eLearning course. Here are a few links to resources, blogs, books etc. that will help you with some ideas.
Essential Guide to Visual Thinking for E-Learning
E-Learning and the Science of Instruction Proven Guidelines for Consumers and Designers of Multimedia Learning /Authors: Ruth Colvin Clark, Richard E. Mayer
The Cambridge Handbook of Multimedia Learning / edited by Richard E. Mayer (available in RRC Library)