Got some questions.
Do how high can german poles reach in german society and its military?
Pretty high. Not all the way up - there is only one chancellor, one chief of the general staff, one guards commander, and these positions are handed out in a closely guarded inner circle. But ministerial posts, general staff appointments, army corps commands, high civil service positions are all open to them. In old Prussia, the question is much more about what family you come from than what ethnicity your ancestors had, and in postwar Germany, German is as German does.
Mind, though, that the price of admission to German society is assimilation. You're not going to face any considerable obstacle just because you are called Kolaski or von Radziwill, but if you refuse to speak German, you're not going anywhere.
Are there any russian population left in the new baden-baden countries? If so how are they treated and if its bad how bad.
There are some, but in general they are assimilating rather than identifying as Russian. That's not a healthy thing to do.
Generally, there is a historical arc to this. Initially, some Russian speakers stayed behind because they did not want to go to the Integralist hell that was their 'home country' (or just didn't want to leave their homes), and they got it pretty bad. Most assimilated, learned the language, played by the new rules. Everyone had a vested interest in the pretence, after all. By the end of the century, things loosened up and people started discvovering their family roots. There are now Russian speakers in Eastern Poland, Finland, Ruthenia and the Baltics facing little or no harrassment, even getting minority funding for cultural events and stuff. But there are not a lot, if there were, things would be different.
What is the relations between baltic german and baltic native? Are the baltic germans still top dog?
By when? Baltic Germans stay the dominant social class for a long time, but not forever. Today, it's a bit like the position of WASPs in the USA - disproportionately represented among the elites, but no longer alone or protected.
Lastly nsp (poland secret police) does it have any pop culture, how does polish population view them?
Well, that's a big topic. Basically, 'the NSB' is a movie and pop culture genre in its own right. No war movie can be without an agent, sometimes as the hero, the last-second rescuer or selfless supporter, sometimes as a corrupt petty tyrant or boneheaded antagonist. It really is a two-edged narrative, on the one hand the heroic story of holding together the young country in the early years of war and hardship, on the other the tale of corruption, tyranny and abuse of power. But everyone knopws the leather jacketed figure on the street corner, the ubiquitous spy-in-disguise, the master of deception and surveillance. And every Pole of a certain generation has a story of the NSB, good or bad, often both.
Today, they mostly subsist on the legendary past. The NSB is just another intelligence service now.