For a written application:

• Write complete address and telephone number on the application letter 
• Do not forget the date and your signature 
• Photo
• A short description why you want to learn this job (not more than A4 page) 
• Curriculum Vitae 
• Copies of the last two school certificates

For the interview:

• Look for information concerning the company before the interview 
• Think about questions before the interview
• Start in time to the company
• Take a pen and paper with you for notes during the interview