How to patent an idea about Cricket

Hi All,

I have an idea about cricket. I want to patent it. But I have some questions.

1. Is it possible to patent about a game? Changing the rules. Not like 50 over to 20 over change.
2. Should I patent in all countries where the cricket is played?
3. Should I hire a lawyer to make the document perfect to patent?(Can any one help me on this if you have done patent already.)
4. How long will it take to get the patent?

I googled enough, but did n’t get clear picture.

Any help?

Thanks.