The good news is that you possess the exact qualities that will make your job hunt in Germany (or anywhere else, for that matter) a success: you're open to new possibilities, you aren't afraid to work hard and you enjoy the challenge of working in a culturally diverse environment. These traits, coupled with your husband’s good job, will allow you to take the time to pursue just the right opportunity.
A job search in Germany isn't very different than in your home country, except you first must make sure that your work-permit documents are in order. Once you've taken care of these, the same job-hunting principles you used at home apply. You must first define your target. In your case, be very specific about what you're looking for in the marketing/advertising arena. Then find the person with the power to hire, and tell them what you can do for them.
It's a greater challenge to job hunt when you don’t have a network of contacts and connections. However you're more likely to take risks you may otherwise never take at home.
You might find it helpful, for emotional support and inspiration, to locate other transplanted Romanians in your new city. Contact your embassy for information about other Romanians and find out how they found their jobs and their advice. Remember that the same successful principles you've applied in the past still apply now.