Are there any formatting instructions I have to observe?
No, you may take all formatting decisions - eg. on type faces and –sizes, margins or line heights according to your own preferences. Likewise you are free to choose the type of paper, double-sided or single-sided print and binding method. You just have to meet the minimal requirements regarding the title page, cover page and appendix in § 7(5) of the regulations for the conduct of doctoral examinations.