Note that some of the resources I linked to above are in German, but some pages will give you a choice to translate to English.
Also note that the German spelling of Luebeck is Lubeck with an umlaut (two dots) over the u.
I found a phone number for a library in Luebeck. I'm not that familiar with German genealogy research. But I have traveled in Germany after learning just a few common German greetings. If you call and say hello in German and ask if they speak English, I'll bet someone would be willing and able to speak with you and maybe point you in the right direction in your search. The phone number, including the code to dial outside the US, is:
011 49 451 1224114
Joining Ancestry.com might help with a records search, and perhaps connecting to an online group that can help with searching for people in Germany. Ancestry.com has a 14-day free trial. It would be hit-or-miss finding someone on City-Data who knows how to locate someone in Germany, but check back often and see if an expert has posted advice.
Finally, here's another link you might find useful:
https://familysearch.org/wiki/en/Lü...many_Genealogy
Good luck in your search, and keep us posted on how things are going!