How do I start a fully online share business without involving any brokers?

I am new to this field. How much it will cost to create a dmat account? And how much balance should be there to do the trading?

You bought the ticket of nse or bse the cost of which is aroung three crore of rupees then only can you will not involve the broker.
As regarding the charges of opening of demat account it is variable from one company to another between 300 to 700 appx.
As for the trading only that amount is needed to the tune of amount you bought the shares. we are also providing all these services under one umbrella of apollo sindhoori capital investment ltd and we are also providing the internet trading with which you are able to trade at home and take free advice from time to time. contact at nfc20006@yahoo.com

I will advise you to contact the Customer Care Executive or Relationship Manager of Kotak Securities Ltd. or Sharekhan Ltd. in your city and ask them to visit at your place for detailed discussion on all of your queries related to Stock Market i.e. opening of Dmat account, online Share trading etc.

Wish you ALL THE BEST.

(Their Web Site Add: kotaksecurities.com/ sharekhan.com)

friend become a brocker is best way to save brockerage. and the way of being brocker is :
Give the exams ( NCFM )of National Stock Exchange. and become a memeber of NSE.
for exams the form is available at http://www.nseindia.com
By this way you will eligible to set a DP also..

friend this is very high level matter..for beginer, right now you need to understand market it self..
so friend..first of all visit
http://www.nseindia.com
http://www.bseindia.com
this are the sites of stock exchanges.
here you will understand the market..
Watch CNBC Live TV channel
then after you have to choose best DP for you,
today online trading is best.
http//www.icicidirect.com
http://www.sharekhan.com
http://www.5paisa.com
this are the sites of various DPs.
today economy at trading brockerage, the 5paisa is more econmy..
but the service of icicidirect.com is very nice and brockerage is Ok..
so choose your best option..

visit
http://www.nseindia.com
http://www.bseindia.com

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,with my best wishes.

As they have said, there is no way you can escape brokerage, unless you yourself become a broker or memeber of a stock exchange.
For trading purposes you will be given an intraday exposure of 5 to 6 times the money you keep with your broker.Demat account won't cost you much.It varies between 300 to 700 from dp to dp.
Many brokers charge less dp charges for their broking customers.It is better to open a demat account with the broker you want to trade with.You will be asked to give POA to them while opening your trading and demat account, so as to enable them to provide you with the margin for trading, keeping your holdings as collateral.You will be given exposure on both your cash and stock holdings with them depending on the scrips.Further you will not be required to give delivery instrution slips to them, each time you sell your shares.Your money and holdings are kept in a margin account unless you ask them to shift your shares to the demat account.For investors, keeping shares in the demat makes sense.For trading purposes you can keep some cash and some shares in the margin account and the remaining in the demat account.
No need to keep any minimum balance unless you want to trade.Whenever you want to trade, as I said, you need to keep cash or scrips in the margin account with them.