This presentation describes how to cache data on your mobile device for those areas where internet connection is not available.
It includes screen shots of the iPhone, ArcGIS Desktop, and ArcGIS Online. This provides complete setup of Caching.
For more details on the collection of data with collector see the Presentation Gathering Data with Collector which is also on this site.
I have updated this document based upon feedback on GeoNet.
On slide 8, Track Keep track of who created and lastupdated features is no longer checked and
In the Notes section for that page:Editor tracking is not supported by collector for feature services hosted on AGOL and checking this box can cause syncing problems.