Things you should do at an Online Casino
Do: set a budget limit for yourself and a reasonable profit amount. Check to make sure the dealer took your bet right: they are after all only human and can make mistakes. Leave while you still have money in your pockets. There is nothing like leaving with money you've won and knowing you actually had some luck.
Do: leave when you have lost your budget limit and can't continue to see others playing while you're not. Keep a low profile. Read all the rules and regulations on a particular game and the terms and conditions of an online casino before you start to play. Confirm an online casino's customer service support: the faster the response, the better the service, in my opinion. Check legitimacy of the online casino.
Do: question things that seem too good to be true. Keep your bankroll at 10-20% of your bets. Learn poker, it's a fun game that can make you lots of money and it's not only based on luck but skill as well which means you can get good at it.
Do: treat the dealer nicely, tip them occasionally and believe them when they say it's going bad. Tip the help in the casino if you feel the service is good, these people don't make that much money and a little says a lot.
Do: apply the three strikes and you're out rule when gambling. If you see that you are losing, move to another table or just leave all together.