When you plan to apply for studying at TH Lübeck, first of all have a look at the appication deadlines. Maybe it is needed or advisible to start your study abroad one or two semesters later, just to make sure, you are well-prepared.
After that, check how to get a recognition for your documents and certifications.
Finally, find out, which platform is the right one to apply for your chosen study program. If you want to study in a field with restricted access, there are some more steps to do and you maybe need more time to prepare your application.