We are looking forward to receiving your complete application documents. Your leaving certificates are thoroughly sufficient. Just list your training and additional qualifications in your tabular CV.
You can submit your application both by e-mail (email@example.com (preferably as one PDF file)) and on paper. How you submit your application does not influence our decision at all.
By the way, there are several opportunities to meet us informally, e.g. at the "Nacht der Unternehmen" in Aachen, at the bonding AutomotiveDay or other recruiting events. Within our website's news section we usually announce the upcoming events we participate in.
Your application documents should contain: