Best place to ask questions like that and even find some of them allready answered is
www.pilots.de, after all LH requires you to be fluent in german anyway.
As far as i know they do not take a previous type rating into consideration and just offer you a spot where they need you most, at the moment that would be germanwings, cityline (quite different from the rest), condor berlin and probably cargo. Mainline, germanwings, condor berlin, cargo and condor are all under a general contract, the so called Konzerntarifvertrag, but there are considerable differences between every one of them. Cityline is not in that contract and pays flightdutytime and not blockhours.