I'm really interested in learning about the game of baseball, since my grandpa used to be an amateur baseball player. 
I love baseball! It's played with a bat and ball - there's 2 teams each with nine players and they take turns batting and fielding
What's the goal of the team that is batting?
The team that is batting wants to score runs!  The more, the better!  
It sounds like a fun game to watch. Where are these games typically played at?
Baseball is played on what is called a diamond - and they usually play 9 innings unless the score is tied
What happens when they get to 9 innings and there is a tie? Do they have overtime like hockey?
If the game is tied, they keep playing extra innings until the tie is broken - and sometimes that can take hours!
Wow, that's crazy. So, people could be sitting the stadium all night! What's the longest baseball game that has ever been played?
I think the longest game was at least 25 innings! They just keep playing because there is no game clock!