First, keep in mind that you should apply early. At least three weeks before you go.
Find the German embassy or consulate in your country that is closest to you. To make an appointment, you should go here. If your country doesn't have a German embassy or consulate, you should find a German embassy in a nearby country. You can also make an appointment online, depending on the embassy.
Fill out the application form as accurately and honestly as you can. Sign both copies that you print out.
Pay the fee for the visa and bring the proof of payment with you.
Before you apply, make sure you have everything you need.
Prepare for the interview by looking online for questions that are often asked in this
kind of situation. Also, ensure you arrive on time, neither too early nor too late.