German universities have a quite good network with universities all over the world. Every year thousands of students have the opportunity to go abroad and spend some time in a different country, studying and living. This should be the same way for international students. Because of this, German universities and technical colleges try to provide enough university places for international students and they also make efforts to support them in many other questions concerning the time abroad.
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You should get a student visa if you are planning to study in Germany. If you have been accepted at German University then it is advisable you apply for a student visa in person for at least 3 months in advance before going to Germany.
All your documents and application will be send to the Immigration Office (Ausländeramt) where you will study. After the application gets approved by the Immigration Office the consulate will issue you a residence permit in the form of visa. You are required to register upon your first arrival in Germany.
You will also need to provide photocopies of all these documents, get proper insurance and pay a fee of 60 Euros for the visa.