If some one get an idea about a New Gambling game, it can be "patented"? If yes how it can be done?
Just as E.G. "fantasy-football" how to protect the idea of a game like this? just with trademark?
Trademark and patent are completely two different things. But here you will need both. Patent for the idea and trademark for the name. This way you can protect your interest.
I will suggest you to get in touch with patent lawyers of your country. Just try to google with this keyword and you will receive plenty of them. They will help you to prepare your documentation. Please note, it usually takes 4-6 months of time to process your patent application.
Finally, always execute a NDA with the lawyer along with indemnity clause before you start expressing your ideas to them!
Hope this helps!