Hi, Angie,
Getting down to the wire for you!
You will go through immigration in T4S. You will then get on the people mover, and then go to baggage claim, and then find the train. After you get your bag, there is theoretically some customs control, but you don't have anything to declare I assume, and you are unlikely to be stopped.
When going through immigration, make sure that you get in the non-EU line. And then, just like when you are in the grocery store, you are likely to find that the people in front of you are the slowest of all the lines you could have chosen from.
My T4 tip is that you should always take the elevator instead of getting on the escalator. Most of the ups and downs are more than one story and the elevator is almost always faster.
Buen camino, Laurie