You can finance your doctoral work either through a scholarship or through a position as a research associate. Such positions can be found in the category Wissenschaftliches Personal at the official job list of the university.
In addition, there are various ways to finance a stay abroad while pursuing your doctoral work at the Carl von Ossietzky University of Oldenburg.
Publishing your dissertation successfully completes your doctoral work. The doctoral degree regulations of each school defines the specific requirements for such publications.
Publishing a dissertation as a printed book is quite expensive and only rarely supported financially.
As an alternative, the German National Library (Deutsche Nationalbibliothek) offers electronic forms of publication.