After the 1st game of a series umpires rotate in a clockwise direction , so the ump at 1st base today will be at home plate tomorrow.
...However , getting notifications for the 1st game of a series you will need a premium odds service such as sports options .... or you can get them free from the mlb site , but they're not usually posted until about 30 mins before gametime so sports options is the best way to go for game 1 notifications.