Here is a check list Besides passport and visa, carry a travel document pouch. Carry enough ready made food
Pack a spare travel shoes just in case they wear out
Vaccination Center’s, doctors phone numbers and medical prescriptions. Travel insurance, international travel card, debit credit cards and SIM cards.
You can arrange your passport, visa, and other required documents as you need them.
Here, I would like to suggest that when you travel in India, you can start your journey from Mumbai.
https://travellifo.com/top-20-tourist-attractions-to-visit-in-mumbai/
India's Mumbai is one of its most populous cities. With more than 20 million residents, this metropolis, formerly known as Bombay, can be referred to as India's most cosmopolitan city. This city, which is near to India's west coast, has slowly grown in popularity with tourists. Mumbai offers a variety of experiences, including five-star hotels, restaurants serving delectable cuisine, neighborhoods where Bollywood movie stars reside, and shops providing a variety of home accessories.
India has several important financial hubs, with Mumbai in particular. It is also referred to as India's biggest city. Mumbai, which is regarded as the center and beating heart of the Bollywood film industry, is always crowded with travelers from all over the world. So let's look at some of the unusual locations you may visit in Mumbai.