I personally would suggest to get in touch with other communities like Open Source/Open Data/Wikpedia etc to set up one non profit entity. It is probably hard to fullfil the legal obligations for such an entity with only the OSM community. In Germany the FOSSGIS (which stands for Free and Open Source Software for GIS) is acting on behalf of OSM Germany. Also Wikimedia, which operates a non profit company here, ensures that we get some funds from the multi million Wikipedia funds. Last year 5,000 for aerial images, this year 20,000 for local language maps etc.
Rather than making me a Goethe, I would prefer a recommendation for a book like “Serbian cyrillic for dummies” 