After being in Rotterdam for a very short span of time I can say that the city is highly systematic.

Indian Community : There are less Indians in rotterdam but many from Surinaam (whose roots belong to India; But that really does not matter).
And yes, there are a lot of people from Pakistan. They share the same culture as we do so. This is also an advantage I feel.

For Travel : Travel is easy with ov-chiipkaart. (for initial stage you can use anonymous one and meanwhile place an order for a persnal card – cost 7.5 EUR both).
You can rent a bike from ov-fiets. They are available mostly at Metro stations. ( I saw it at Rotterdam Centraal)

For Religious Interests : There is a sikh Temple ‘Gurudwara’ in Kralingse Veer and it is core Indian. You can meet people get mental peace and have ‘prasad’ (in the form of langar).
There is ‘Arya Samaj’ near ‘Mini Rotterdam’ (you can search in google.
There is also a ‘Shiv Mandir’ near Arya Samaj.

For Sporty people : There is bungee Jumping at De Pier (Den Hague). At the same place there is ‘Rope Way’.
Also there is Water Skiing at ‘Nesselande’ opening during May/June every year.

Indian Shops :
There are Indian/Pakistani shops near Bergweg.
There is Indian/African shop at Coolsestraat.
There is Tanger Markt at Nieuwe Binnenweg.
There Indian/Pakistani sweet shop at Dordtselaan (near HengelSport Ahoy).

Till now I have explored this much
But I will keep you posted with whatever new and useful I get to know.

Have a nice time everyone!