Initially you will need to set up a 2 column page and request the timeline control is added to the page (to request this please log a call on the IT Service Desk). You will also need access to edit a data.txt file in the same folder as the page.
The data.txt file will contain examples of the different types of content that can be included on the timeline.
The data.txt file contains code written in JSON format. To validate your code you cna use an online tool such as: JSONLint
For full documentation on the timeline functionality also see: Timeline JS website