To become a trader u need to get educate first. Now  a days u will get a lots of video, book, online site  to which u will refers and learn from it. There a tons of book from which will give a knowledge about trading which is theoretically knowledge or u can buy any course or u can join any classes for it. 

After u can open Demat-account anywhere which is lost cost brooking( i.e for trading they will charge less amount). In India there are like zerodha, upstox, sharekhan are low cost brokers.

When people start trading they will think that on first day itself i will become millionaire, but i reality its nothing going to happened. Trading is the game of best of best to earn consistent money form market. Now a days million of people opening demat-account why ? because they hear from some friend, family member, relatives that they have earn a lot of money from it which is some what correct. I have seen lot of people they can't share their losses but on the day of profit they will inform u. 

Firstly, u need to educate u self and then come to market and practice for few months that u have learn and check the ratio of profit to loss. To become consistent in the market to earn u need a setup which work for u. Every trader have a different mindset, different psychology to trades.

As a trader u need to select a particular no of stock from the list and then back track your strategy which u develop. There are a traders who trade all the stock but they will not become successful in the market. When u select a particular no of stock to trade then u will come to know about that stock who they are performing on which day. When u are buying a share don't buy it simply that it is going up, need to have a proper reason to buy or sell. 

Always when ever u buy or sell then u need to place a stop loss to which u can sell the share. Here people come greedy when they saw that its value got increase by some % and they think that it will go up and at last end of taking loss. As a trader u need to follow a risk reward ratio to buy or sell( At this price i will buy and when the price come below that i will exit my position from it).