Paragraph 1: present and explain the aim of the cover letter.
Paragraph 2: why you are interested in the company that you are writing to, in this industry and in this particular position.
Paragraph 3: what you contribute (achievements, experience); abilities and capacities that you will use to carry the position’s functions.
The order of paragraphs two and three can vary based on how you want to write the cover letter.
Paragraph 4: invitation to the interview. Be creative when finishing the letter; do not use the expression “I wait for your call”. Mention that you can call to arrange an appointment or meeting, not an interview.