Pan Card

Before thinking of shares, you should have a PAN card. Then you should open a demat account. You should have a bank account. Then you should register as a client with a share broker. Consult a share broker. He will help you out in this connection.
Every time you buy or sell shares, you will be automatically paying transaction tax. As per your question, at present your salary income is below taxable. OK. The shares are of 3 types.Same day buy and sell without delivery.you treat the shares buying and selling as your business. Purchases and selling of shares on delivery basis.All the above three types attracts income tax. This shares income will be added to your income. If your income (Salary+Shares+any other income) is above taxable, then you have to pay tax according income tax slabs.)To avoid clubbing of shares income to your income, you can plan like this: Instead of you name, register your wife or mother or fathers name with the broker (who do not have any other income