How do I get from Berlin 0stbf to Berlin Hbf?

Nikkers is right, but her link is only temporary..

use the page of the "deutsche bahn"
http://www.bahn.de/p/view/international/...

here you麓ll find the information you need.
take the s-bahn. it takes 11 minutes.

Like this: http://reiseauskunft.bahn.de/bin/query.e...

Take the S-bahn there are ample maps at each station and on each train.. but these are the ones you want:

Use Train S-5 towards Westkreuz
or
S-75 towards Spandau
or
S-9 towards Spandau
or
S-7 towards Potsdam

All these will go right throught the Hauptbahnhof

All for only a few Euros.

Sbahn from platform 8 or 9.

The vast majority of long distance trains top at both now (unless it's international to/from eastern europe, which varies). In case you wanted to change stations anyway, it's the 5th stop on the S-Bahn to the west. You can take the S3, S5, S9 and S75. They'll all go from the same platform though because they're all going the same direction. If it says Westkreuz or Spandau it'll do. Hope you're not just passing through Berlin, because you'd be missing out on a great city!

The info above is correct, just take the Sbahn. Its only about a 15-20 min ride and costs only 2.10 Euro. Its super easy.

4 stops on the S Bahn towards Spandau, or 2 stops if you use the RE (the red double deckers). It's about 30 mins brisk walk if you feel like a spot of excersise. Follow the river.