The first thing you need to do is not to expect too much from gambling, such as suddenly getting a jackpot of a lot of money. Then how do you prepare yourself for gambling, first you have to choose a reputable platform, and then you have to know their rules well. Then gambling should be done keeping in mind that their rules and regulations should not be broke, because many times the fund of large amounts is frozen due to the breaking a small rules. So keep that mind.
What I mentioned earlier is that you don't have to expect much and you have to start with a small amount as a trial in the beginning, because gambling is high risk here your entire money can be lost at once. Moreover, gamble on the games that you know well and can.
Don't lose hope. But don't invest more than you can afford to lose.