We have discussed about bankroll management on this board too many times in different ways and ideas that most gamblers here have shared, it can never be overemphasize and we know that having a good skill of bankroll management can really help the gambler stay away from addiction too. For a new gambler, it's really of great importance since they are just starting and need to start with a good habit.
New gamblers should endeavor to know how to manage their bankroll if they want to be responsible gamblers. Knowing the amount to gamble is important, it's same as knowing how what you can afford to lose. If in any way they win a bet, they shouldn't be too happy to wager too much because without luck there is nothing like winning.