Hi,
the advice of cph_flyer is correct and probably the fastest. If you have some time to spend you can also easily add some sights in the west of Berlin, like the Gedächtniskirche or the KaDeWe (one of Europes biggest shopping centers).
A little map which shows all possible connections from ZOB can also be found on the BVG-page:
http://www.bvg.de/index.php/de/binar...75182/file/1-1
cheers
757DUD