Injury Questions

i am sure this has been asked before but...
1) I know players with over 600 at bats are generally safe from injury (I believe they only get hurt for the game or perhaps 3 games at most) but is there a breakdown for other at bat totals? For instance, would there be a big difference between a player with 450 at bats and 550?
2) How do injuries for pitchers work? If I have two starters with less than 100 inning each should i expect them to get injured a lot during the season?
Sorry for the long questions
Clayton
1) I know players with over 600 at bats are generally safe from injury (I believe they only get hurt for the game or perhaps 3 games at most) but is there a breakdown for other at bat totals? For instance, would there be a big difference between a player with 450 at bats and 550?
2) How do injuries for pitchers work? If I have two starters with less than 100 inning each should i expect them to get injured a lot during the season?
Sorry for the long questions
Clayton