If you're still needing help via a more visual guide for this track, I'd recommend the following video below from Batman Arkham Videos. It breaks down all of the steps for each step in the track and gives a solid guide on completing them.
The crux of the 15th step (Stop a Crime In Progress in each district) can be carried over to a new save. If you have completed the Firefly battle or finished the main story, a C.I.P. will not happen naturally, you can go into New Game+ and then get the one that appears on the bridge there.