An MLB Debut is when a player makes his first appearance onto the field or at the plate
Alex Rodriguez's debut was July 8,1994 for the Seattle Mariners.
April 12th, 1998
Jackie Robinson's MLB debut for the Brooklyn Dodgers came on April 15, 1947.
George Herman "Babe" Ruth made his debut with the Boston Red Sox on July 14, 1914.
Brooklyn Dodgers
Louis Castro made his debut on April 23, 1902 with the A's.
Alex Carrasquel made his debut on April 23, 19939 with the Senators.
Alex Rodriguez made his Major League debut on July 8, 1994.
April 15, 1997 was the 50th anniversary of his debut in MLB. He played his first MLB game on April 15, 1947.
Andruw Jones Made his Major League Debut on August 15, 1996 at the age of 19 years 4 month old for the Atlanta Braves.
Anywhere where you can watch videos (youtube, google videos,etc)
His mlb debut was in 1985 at the age of 26. His last game was in 1994 at the age of 35.