The fast-bowling all-rounder said conditions in England and Bangladesh, where they drew series 1-1 before coming to India, were different from here.
"We had a lot of referrals over there. We have got to be quite clear with the communication, It's a bit different with the ball spinning in India rather than it seaming and swinging in England, so it is a bit hard to judge," Broad said.
"We are looking for the wicketkeeper and the bowler to make quite stronger opinions on it and obviously Cooky (Captain Alastair Cook) will take over and go with the gut feeling. We could have done well in Bangladesh. In Dhaka we wasted a couple," he remarked.
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"We are coming as massive underdogs, there's no doubt about that. Obviously, India has got to number 1 in the world and played some brilliant cricket here, so we're very aware that it's a huge challenge. But it's pretty exciting as well, we're not really sure what to expect," Broad said.
Talking about his upcoming milestone, Broad said what excited him more was it was to happen in a huge series and against the world's top-ranked side.
"I am aware how special an achievement it is because of the players that have come before me. The amount they have given to English cricket, it's a special cap to receive. What excites me more is this 100th game being the start of a huge series for us as well. There is no bigger occasion than starting a series in India, against a No.1 team in the world.
Asked about the team's mindset after suffering its first ever Test defeat against Bangladesh before crossing over into the country, Broad said their players would like to express themselves well here.
"We have beaten India, I think, three times on bounce in a Test match series. We are aware that it's a tough place to come and play cricket but also we have got nothing to fear because not many of us have actually played cricket over here. So, that's positive in the fact that you can go out and play natural games and take the game to India. But also, we will have to learn quickly.
"So it's been a very direct training, very focused training, rather than getting out in the middle, 'let's get our technique right and hopefully that will look after us this week."
He also talked about the positive impact of playing a five-match series.
"Like we did last time, India beat us at Lord's and we won the last three Test matches to win the series. So, it does really give you chance to assess conditions and get used to them a lot. But downside is you play five Test matches in six weeks I think. If you are not in the 11, if you are not playing it doesn't give you lot of opportunities to play cricket elsewhere, does it?" he added.
"I have always seen myself as a frontline seamer. My dream is to try and get the new ball for England because that's when you become more of a strike bowler, that's the best chance to make impact on games. I am only 30. I hope to play for a long time.
"I certainly want to have the opportunities to score a lot more runs, and hopefully that will come in the series. It is something I see as a momentum change rather than somebody who is going to have some big numbers behind them," he said as explanation to his pretty dismal record with the bat.
"You look at teams that have come here and won - Australia had Kasprowicz, Gillespie and McGrath, our last tour here with Jamie (Anderson) - I think he took 20 wickets. (Dale) Steyn took 26 wickets here with a huge amount of reverse swing. It's going to be our biggest armory. But also that new ball is a bit like Dukes, you can make breakthroughs with it as well.