I’ve been to a few different ones.
You’ll notice that every church usually has the stations of the cross posted along the walls. Typically the priest processes around the church stopping at each station to say prayers. Sometimes people process with the priest, sometimes they just stay in the pews.
At each station the priest announces the station (e.g. “The Sixth Station: Veronica wipes the face of Jesus”), then the priest says “We adore you, O Christ, and we praise you.” and you respond “Because by your holy cross You have redeemed the world.” The priest then reads a reflection on the station, and then leads the people in an Our Father, Hail Mary, Glory Be. Sometimes at the end the priest says “Jesus Christ Crucified” and you respond “Have mercy on us” and then the priest says “May the souls of the faithful departed, through the mercy of God, Rest in peace.” and you say “Amen.”
Then the priest goes to the next station, etc until they have all been done.
Sometimes the people kneel at each station.
But like the above posters have said, it is a little different at every church. But this at least gives you a rough idea.