Event Hub and Cosmos DB are really intended for applications of a decent scale. Chances are, if this is being used for a small network that you'll be some way off that.
Tasks:
- create an Azure Queue Service and an Azure Blob Storage example
- create instructions
- work out the scaling point where one method outweighs the other
Extension task (maybe a follow on Issue) - would be to solve the visualisation problem for this alternative set of systems.