I am planning to move to Germany

Dear Indzi,
You have come to the right forum for advice on all aspects of moving to and living in Germany as an expat!
Your question is too general to be answered, but since most of the related issues were already discussed in this forum, I encourage you to read that first - and come back here with more detailed questions that were not yet addressed.
Good luck!

Immigrating on the basis of investment is wishful thinking. If you would present a solid business plan to start a business that fills a needed market opportunity and have the hundreds of thousands, if not millions; of Euros most would need then it might be a possibility. But for a non-EU foreigner to accomplish this in Germany unless they know the language and business environment as well as specific knowledge in the specific sector as well as having professional contacts and networking is doubtful.

Most Indians that manage to come to Germany are experienced in high tech like IT or a doctor level research science. And for many jobs a high level of German is required. There are lots of professions where one might have a good upper middle class life in India that won’t present any opportunity in Germany since they either not in high demand or one doesn’t have the language skills. Knowing English for example can even be required but in addition rather than as an alternative to German.