Hi,
ich bewerbe ich mich gerade für ein Praktikum im Bereich Sales/Marketing. Würde mich über Verbesserungsvorschläge und Kritik sehr freuen

Dear Mrs XXX,
As a student of International Business and Management at XXX, I am eager to apply the strategic marketing and language skills I have gained to benefit your company.
During my time at university I have gained a broad understanding of the organization, management and implementation of plans within a team. Since I worked within different groups, I feel I have significantly strengthened my knowledge and understanding of working in an international environment.
My past experience of working overseas as a XXX has brought me a greater understanding of customer relationship management and the international marketplace. Not only my experience of working with a multinational company but also my theoretical and practical knowledge gained at university lead me to the conclusion that I am very suited for an internship with your marketing and sales department during the six month period of May 2012 to January, 2013.
I enclose a copy of my CV and look forward to hearing from you.
Yours sincerely,