On Jobspotting, you can browse a rather small variety of (6 job offers) in Wildau. Subsections include most dominantly Retailing and Sales Promotion. The most seen topics for these jobs are Retail, Request For Proposal, and Negotiation. Are you familiar with them? Fashion at present is out in front with 33% of companies that are looking for applicants, followed by Home / Furniture (33%), and Computers (16%).
It's a junior applicants market at present, with 2 of available Sales job offers seeking applicants who can learn on the job! Among the companies who look for Sales employees, there are currently no startups. Why not have a look at jobs in another country to compare and contrast opportunities. Just use the Explore tab.