The 12 issues are fine.
A lot of the tie ins are just the Monitor appearing in comic books. Nothing major.
What is important is what happened AFTER Crisis.
There are farewell issues for the old Superman
Legends by John Byrne
Man of Steel by Bryne
A new Flash Series
Wonder Woman by Geotge Perez
Justice League International
Batman Year One
Shazam
After you finish Crisis
Look.at my Super Hero Genre History to find those events around 1986 1987.