Company is important for a person outside india to do business in india. All process from taking digital signature. DIN and all form filling.
PAN AND TAN are required for income Tax And GST on sale of goods and services.
Many businesses fall into automatic route where only intimation to RBI is needed, but for some RBI approval are also needed.
Indian laws require monthly return filing of TDS and GST, proper accounting is needed on regular basis.
Bank account in a MNC Bank, compliance of all documents of directors and Company, opening two accounts, one USD account and other domestic currency account.