Yes. There are frequent trains from the airport to the central train station, and from there on to Fidenza. At least one an hour to Fidenza, so you don't need to worry about making a particular train, or buying a ticket in advance. (Tickets on the regional trains are the same price whenever you buy them). It's 1 -2 hours from Milan Centrale to Fidenza. The app for the national rail company is very easy to use and it's in English. Trenitalia.
As SapsP points out, Milan Centrale is enormous, but you'll figure it out, and since there are so many trains to Fidenza, it doesn't matter if you wander around lost for 10 minutes or so.
This assumes you're coming in to Malpensa, which is the main Milan airport. If you're coming into Linate, there's no train connection to Milan Centrale, but there are frequent buses.
Fidenza is a beautiful city, and a great starting place. After some warm-up walking in the last of the Po Valley, you hit the Apennines. Spectacular. But you probably know this already!
