Sarada,
Welcome to the pet's forum.

As Bhooma clearly stated, it is a big commitment. This warning is not to scare you, just a heads up. When we adopted our puppy, initially I have to wake up every 3 hours and take her out. After a month everything was within our schedule. Taking care of a small pup is like taking care of a baby. If you adopt a dog which is above 4 or 5 months, you need not have to get up at nights.
When you are going for a vacation, I suggest that you leave your pup in some dog care/in any of your friend's house. I usually leave my pup in friend's place when I have to go for a trip. For relocation to India, I am giving you a link below which will clearly explain in detail.
Airlines in India pets dogs cats allowed
I have a dog which is 2 years old named Taffy. She is an awesome puppy and gives us tons of happiness. I spend about $20 a month for food. I spend about $50-60 a year for regular check up and vaccination. If the Vet recommends for blood test ( only if the dog has some problem), then you might have to spend another $50.
Regarding the cost of the ticket for the pet, it is about $500-800 for small breeds and about $1500-1800 for big dogs. You have to call airlines and see which one is giving a deal. There are also companies which takes care of all formalities and helps you in relocating the pups, but they will demand you more money.
Feel free if you have any more questions.
All the best,