An 1 1/4" line may supply 32 gpm if the line is short. Your restriction will be the 1" inch meter and 1" if the line to your house is short most of your restriction will be in the meter.
Plan on you have about 10pgm. You should be able to have 5-6 sprinlkers per station. Make sure you increase the size of the water line coming from you meter to 1" or 1 1/4" and you should be fine.