I understand what you are asking for (Ich habe Deutsch 4 Jahre in Hochschule studieren). However, for creating the new account in the iOS appstore and in android Google Play, it would require many details about your bank account, etc.; maybe you might want to create those accounts yourself (we can help to guide you, but you don't need to tell us your bank account number).
Once your new account is set up, we just need:
a) the old account credentials
b) the new account credentials
c) the source code
for both iOS and android, and we can do necessary configuration and uploading for you.
thanks