There is a special visa for people who want to set up their own business in Germany. One of the things you need to apply for this is a business plan for your company.
The "Make it in Germany" website provides important information on these topics:
- Preparing a business plan
- Applying for a visa for start-ups
- Further topics related to self-employment
If you’re also interested in setting up a business in your country of origin, this is where you can find opportunities.
The best thing is to get advice. If you want free support to fit your personal situation, this is where you can find advice.