So here is the quick answer: Good poker players in small stakes online games like 1c/2c to 50c/$1 will make betweenR$600 andR$5000 a month. Good poker players in live games likeR$1/$2 toR$25/$50 will make betweenR$1000 andR$10000 per month. Good high stakes poker players will make 100k per month or more.
So if you playR$1/$2 live cash games and buy in for 100bb, orR$200, then you should have a bankroll of at leastR$4,000. And if you playR$25NL on online and buy-in for 100bb then you should have a bankroll of at leastR$500. This rule ensures that you never buy-in at the table for more than 5% of your bankroll.