One good place to start is here
http://dr1.com/travel/index.shtml On left side of page, you will see a list under "Destinations". Reading the info there will get you started. If any of these destinations sound particularly interesting, that could be basis for further questions and also for research in the dr1 archives.
Lots of map sources
http://www1.tip.nl/~t794614/mapdr.htm
http://www.hispaniola.com/DR/maps/
http://www.multimap.com/index/DR.htm
http://bocachicabeach.net/maps.html