I won't help you completely but yes I would suggest if you want to travel the whole world you need for your flight, hotels and for eating at different places which will cost you a lot. But what if you save a lot money in your flights and hotels? Now you can spent that saved money to eat or in next trip. How?
There are many travel agency which provides you the flights at cheaper rate, some of them are makemytrip, yatra, superfares, etc.