If your organization doesn't have an ArcGIS Online subscription yet, sign up for a free 30-day trial. You can invite up to five named users to participate in the trial, and you get 200 service credits. You also get a number of productivity apps as part of your trial, including Collector for ArcGIS, Operations Dashboard for ArcGIS, Esri Maps for Office, and Esri Maps for Sharepoint. Once your trial is over, purchase a subscription and continue to use all the features and services in the same ArcGIS Online subscription account. To sign up for the trial, go to esri.com/agoleval.
See also "ArcGIS Online: What's New".