Demat account

#1
Hello friends,I want to open a demat account.I have never opened one and never done trading.So here are my few queries:-
1)where should I open demat account,(sharekhan,icicidirect,sbi etc)considering the fact in the beginning very few trading will be done?
2)I want to buy a share ,which I want to keep for more than 1 year,as after that there won't be any tax.Which oned should I buy?
 

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