roamer excellent questions.....There are two leagues in Major League Baseball...the American League and the National League.
Each team will play 162 regular season games...teams generally get 1 day off a week unless they go through a series of "rain outs" and then they can play 2-3 weeks in a row to catch up towards the end of the season.
Just the winners of each division AL and NL East, Central and West Divisions advance to the playoffs with one "Wild Card" team, the team with the best record that does not win a division, advancing as well.
The four AL teams play off against each other, likewise the NL teams...the winner of the Al then meets the champion of the NL in the World Series
in a best of 7 games match up....it is the most historic sporting event in the United States with a tradition that goes back into the 1880's or so...
This ball park Wrigley Field is in Chicago.....
...it is one of the most beautiful venues in all of American sport. Capacity is approx 40,000, Standing Room Only, and they sell out about 99% of the time and will draw 3 million fans for an 81 game home season....the only teams that don't draw well are the perennial losers such as Kansas City and Tampa Bay.