it all depends on his size at this age....my son was 13 and his longest home run was 360 ft but has hit the centerfield fence when he had just turned 14 which was 402 ft and hit several over 330ft- 360. That was in June 2010 and was about 5ft 11in 195 but now he is 6ft 210 and will be 15 in Aprill 2011. But do not worry about homeruns but "on base percentage" is key.
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It would be good to be able to throw it about 150ft with accuracy. Dont throw the ball high for distance, keep it as low to the ground as possible without making it touch ground more than once. Play long catch a lot and do a drill that involves setting up a garbage can facing you, so that you can throw into the opening. That is how Roberto Clemente became a great thrower.
210 to 220 feet would be left and right field distance.
It varies among kids just like in the major leagues. Some 14-year olds can hit it 300 ft. and others can't. It can also depend of the type of swing the player has.
the bases are 90 feet apart. Kids first play 90 foot bases when they play in a 13 year old division.