International flights can be taken from Bangalore, New Delhi, Mumbai and Chennai. There are 2-3 daily direct flights by Jet Airways and KLM to Amsterdam from all these Indian metros, each. While this is typically the most convenient connection, even at if a slightly higher cost, you can also take a flight by Etihad/Qatar/Emirates etc, since Amsterdam is well connected to all the major airports of the world.
All major European airlines and several smaller ones offer flights to and from Amsterdam. Being the capital of Netherlands and an extremely popular European destination, Amsterdam has flight connectivity from the Americas, the Middle East, Asia and several African countries as well.
Renting cars in Europe is another popular way of getting around, especially if you plan to cover multiple cities. The roads all across Europe are a joy to behold. Routes and connectivity between Amsterdam and other cities is very well established, just like routes taken by buses.
Rail services are very popular all across Europe. They are considered to be the most convenient modes of transport, not taking too much time and also providing a cheaper alternative to air travels. Direct trains from cities like Paris, Berlin, Brussels, London, Manchester, and almost all other European cities are available.
Bus systems are well connected in Europe. They run between Amsterdam and other nearby Dutch cities such as Hague, Haarlem, Rotterdam, Utricht and internationally from many cities in Germany such as Cologne and Frankfurt, Paris in France, Brussels in Belgium, and even from London in the UK.