If you are not sure what vocational training course you would like to do, start with this: gather as much information as possible to get to know the German world of work. Speak to others who have been working in Germany for some time about their experience. Also ask employers about internship positions in order to get to know professions.
Germany offers many training pathways
If you experience problems with your professional orientation in Germany, then you should definitely get into contact with your employment agency ("Agentur für Arbeit") or your job centre ("Jobcenter"). These will help you to find a suitable vocational training position and provide you with addresses of companies where you live or throughout Germany.
If you accept a vocational training position, you are free to choose your place of residence in Germany. There are no upper age limits for vocational training.