A successful player IMO must (MUST) have the following and know 100% the value of each and what they are.
Bankroll. Your total gross funds set aside for gambling Buy-in money. Your total Bankroll should be 20 times your Buy-in amount. Your Bankroll must be replenished at the end of EVERY single gambling session if won. If you lost more than one consecutive session, once you do win, all winnings held onto, must replenish your Bankroll. All winnings over your Bankroll, should be used for other things, rather than gaming and the fallacy of increasing your Bankroll will make you rich and all that ridiculous trash. (Sorry but it doesn't work that way). IMO, all that playing to build larger Bankrolls will do, is devalue the Bankroll itself to you and cause you to play well outside of your true 'Level and Plateau'.
Buy-in. Your risk capital funds you are bringing to the casino to buy-in with. I would seriously recommend one Buy-in with the total view as risk-capital. If you lose the Buy-in, session/trip over. A Buy-in should never be in excess of 10% of your Bankroll. Note: Maybe an extended multi-day trip say a long weekend out of town. 3 Buy-ins, covering 3 days attempt to profit. Once a session is well above your Buy-in with wins, you must implement MMM with some kind of 1/3rd, 1/3rd, 1/3rd type of money management for your winning funds to be 100% safe.