Narmatha,
A warm Welcome to the Forum.Any Broker having National presence & having internet based Trading Platform,like Indiainfoline / Kotak / Indiabulls / Sharekhan ,can be choosen,the Relationship Manager of that Broker with whom you may have to interact time & again (being a newbie) should be either near your office or near your residence.
Brokerage whether more or less should not be a prime concern now,service / reliability
should be more priority,later on you can just shift your money & shares from this Broker after you get a Hang on the situation.
Asish