How to properly manage the transition from an unfavorable economic situation to one of abundance?

I am currently studying medicine and I am worried that when I graduate I will go from having few resources to having a large amount of money all of a sudden. I am afraid that I will not know how to properly manage my finances. My cousin, who was also poor, graduated as a clinical oncologist four years ago, bought a Bugatti Chiron, but due to his poor financial management, he now spends most of his salary on paying off debts.

How to properly manage the transition from an unfavorable economic situation to one of abundance?
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