The first 40+ year old starting pitcher to win a world series game was Kenny Rogers.
The first World Series MVP award was given out in 1955. It was won by Brooklyn Dodgers pitcher, Johnny Podres.
Old-time pitcher Pud Galvin had 364 lifetime wins, but his career ended 11 years before the first World Series game was ever played.
Babe Ruth for the Boston Red Sox in Game 5 of the 1918 World Series against the Chicago Cubs ... he was the starting pitcher and batted 6th.
Jim Bagby of the Cleveland Indians hit the first home run by a pitcher in Game 5 of the 1920 World Series.
That would depend on when those five runs were scored for the pitcher's team. If the team was always behind in the game, the first pitcher would get the loss. However, if the pitcher's team made the score 5-5 before the relief pitcher gave up the seven runs, then the relief pitcher would get the loss.
Yogi Berra hit the first pinch-hit home run in World Series history, off Brooklyn Dodgers pitcher Ralph Branca in Game 3 of the 1947 World Series.