this forum isnt really berlin specific, but you could check it out and ask around...
http://eingangradforum.de/ im studying in germany and i love it here, i hope you do too.
but what was said about getting a job is.. well, sadly true. what you could end up doing is maybe getting a job teaching english, but you kind of need to know a bit of german to do that...
the overall fixed gear scene in germany is well, pretty non-existent, i dont know how it is in berlin but most people here dont even know what a fixed gear bike is.. couple roadies, and lots of people just riding this city commuter type bikes..
viel glück und viel spaß wünsche ich dir.