Here is a link that will help a new to D-Star user.  Have a read.

http://www.dstarinfo.com/

D-Star Radio Equipment by Icom & Kenwood

http://www.icomamerica.com/en/products/amateur/dstar/dstar/

https://www.kenwood.com/usa/com/amateur/th-d74a/

The PAPA System Repeater Network in California

http://www.papasys.com/