1. You shouldn't spend much money because it will harm the family. (Limit your funds)
2. You must have good self-control, it is one of the keys to be successful in gambling.
3. You mustn't get loans, you will be trapped in debt at the end.
4. After you can win in a gambling game, you are better to stop (break for a while). Don't be greedy to push your luck!
5. Don't expect much to win in gambling, most of them are luck-based. Think rationally!
6. Don't spend all your time gambling, have enough time for family, friends, and society.
7. Etc
I simply believe only the second suggestion will be more than enough for any gambler because when you are having good self-control then you will be able to keep everything under your control which must be the only think that most gamblers are lagging.
I mean when you are good in self-control then you will not spend big money in gambling. This will enable there is no need for getting loans for your gambling purposes. When you're in control, you will not look for getting easy money from gambling and you will understand that all gambling is just luck based one and playing with it hard will not yield anything and obviously a strong self-control will not let you spend more time with gambling

.