Welcome to the DPS 2015 forum!
To get started, use your Adobe ID to sign up for a beta account: www.adobe.com/go/dps_beta
After you sign in, use the Resources page (www.adobe.com/go/dps_beta_resources) to view and download what you need to be successful:
As your questions about DPS 2015 here in this forum.
Here is a question already: how can a preview a document with overlays from within InDesign CC 2015? Thee is no preview command under the file menu anymore nor a preview command in the CC 2015 overlay panel...