The competitive Business Development area requires applicants to have quite a lot of competence. Therefore, an intern is necessary for most, and Berlin is a at present great place to look for one! Companies are looking for both Business and Marketing employees within this area. You should be familiar with areas like Sales, Account management, and B2B - they are very commonly mentioned in job offers. Fashion at present is out in front with 11% of companies that are looking for candidates, followed by News media (8%), and Search / Recommendations (8%).
Getting in on the ground floor has never been easier for Business Development applicants. 60% of companies advertising these kinds of jobs are startups. Why not have a look at jobs in another country to compare and contrast opportunities. Just use the Explore tab.