I second the advice to speak to a current Catholic. The liturgy has changed a bit in the past few years.
One thing you will want to consider for your character is whether he's a "token" Catholic (basically going through the motions regarding church but follows the basic tenets and ethics), a devout Catholic (his religion means a lot to him but not overly in your face about it), or an over the top, evangelical Catholic. That will define how he views and interacts with the world around him. For example, does he go to prayer meetings? Is he part of the church choir, meaning regular practice nights? Does he volunteer at church related functions or even at non-related functions as part of his faith?
Also, think in terms of what the character would do in a particular scene, not what you, the author, would do.