Last year was my first year and I used the touring plan at https://touringplans.com/universal-orlando/events/halloween-horror-nights-orlando#. It worked well for me. I was able to see every house throughout the night, although I did miss the shows, but I did ride several of the rides (including Gringotts at Harry Potter).
As usual, the best advice I found is arrive early, stay late, and choose a date far away from October 31!