I've recently become a baseball fan, though I'm still trying to learn about it - what is the final championship called?
The final game  series is the World Series.  
I know baseball has been around for a long time - when did the professional games first start?
Not sure when it started, but NBC aired the World Series from 1947-1956.
I like to cheer for the Toronto Blue jays - are there any other Canadian teams?
2016 Toronto Blue Jays season
The 2016 Toronto Blue Jays season was the 40th season of the franchise in the American League East division of Major League Baseball, and the 27th full season of play (28th overall) at Rogers Centre. They advanced to the playoffs where they defeated the Baltimore Orioles in the Wild Card Game and the Texas Rangers in the Division Series, before losing to the Cleveland Indians in five games in the American League Championship Series.
Off–season.
General manager Alex Anthopoulos rejected a five-
Reading Festival on August 27, that she did not care about being in the charts, but was more interested releasing what she wanted to; commenting that she started in 1964, and did not become famous for nine years "I would never accept having my career moulded by other people ... I've kept working consistently even though I've not been in the charts." Around this time Quatro recorded a new album that was shelved until 1997, when it was released under "Unreleased Emotion" Quatro briefly returned to recording