First time in Mumbai. Moving near Malad West for an internship – need advice on housing, expenses, and surviving the city!

Hi everyone! I'm gonna be moving to Mumbai in January for an internship. So I'm gonna be looking for places to live in-and-around Malad West. How much can I expect my monthly expenses to be? (I would be living with either one or two of my friends in a PG). What all things do I need to keep in mind, as this is really my first time moving out. How do I manage my finances smartly considering there'll be hidden expenses which I'll only get to know when I finally move out. What would travel look like in Mumbai? What are the fundamental do's and don'ts that I should follow? Your favourite hacks and tips, and all the necessary skills to live in a city different than your own? Every piece of advice is really welcome. P.S: - I'm not scared lol, just a Lil bit nervous. (And really freakin excited!)