In my world, we are starting up Spring Training. I am new to the game. It says that you do not want to play your starters more than half a game. Where do I specify how many innings to play a player? 

Thanks!

You can play your starters for a full game if you want. But to have them replaced mid-game, you first need to set your player rest settings. Go to:

Manager's Office
Manager Settings
Player Rest

and you can set the order in which the backups enter the game. I'd suggest just using the recommended hierarchy. Then go to:

Manager's Office
Manager Settings
Edit Manager Settings

and scroll down to the player rest setting.

Remember that any ABs or IPs carry over to the regular season as far as fatigue is concerned. IOW, if a guy is capable of 500ABs before starting to fatigue and you bat him 50 times in ST, then you are going to see him start to drop below 100% fatigue after 450 regular season ABs.

Posted by torrone on 3/6/2012 10:05:00 AM (view original):
Remember that any ABs or IPs carry over to the regular season as far as fatigue is concerned. IOW, if a guy is capable of 500ABs before starting to fatigue and you bat him 50 times in ST, then you are going to see him start to drop below 100% fatigue after 450 regular season ABs.

Well, not quite.  The fatigue model for position players is a little more complex and dynamic than that.

For position players, as long as you keep your guys down to no more than 25 AB's or so, you should be fine in the regular season with no impact on their fatigue from ST games.  There's really no reason to give anybody more than that.  It's when you do push them hard (18 games, 75 AB's) that you will see early fatigue during the regular season.

Pitchers work differently with respect to fatigue.  They fatigue and recover on much shorter and predictable cycles.  No reason to give them more than 3 or 4 appearances, 10 IP's.  The minor league guys who get the work in the last couple of ST games may see fatigue at the beginning of the regular minor league season, but they'll recover after the first game or two (depending on how hard they were worked at the end of ST).

Starting pitchers, give them 2 starts, relievers no more than 5-6 innings, position players topping out at 30 at bats.  If you bring up most of AAA to the spring training roster, you can keep everybody fresh for the season.  Should you set rest, or shorten the starters spring outings, remember to reset these numbers back to normal at the end of spring training.