It is a different number every year. It all depends on the talent level.
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This varies by league. Many leagues do not have a roster maximum. Competitive high school leagues will have roster maximums around 25 players. However, on the field at any time there can only be 9 defensive players, the same as Major League Baseball.
No you need nine for a full team.
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They find the best high school baseball players in the nation. The best pitcher, 1b, 2b, 3b, etc.
In Canadian football, while only 12* players are playing on the field at once, teams need more than just 12* players. They must have an offensive and defensive team. Most high school football teams have 1st, 2nd, and 3rd string players, so thirty to forty players is a reasonable number. * only 11 in American football
Each league (little league, high school, college) has its own limits as far as how many players can be on a team. In Major League Baseball, there are 25 players on a team.
unless u are the best in D-3 it is very unlikely
Technically, you don't need any education beyond high school, many players are from foreign nations and have only high school educations. Many players do have some college experience, however, it is not required. Baseball is different than basketball and especially football in that there isn't a huge gap in physical development that must occur to become a professional. Baseball has a good minor league system to develop a lot of young players where college would train basketball and football players.