If it's within budget, strongly consider the Express pass.
The Stay and Scream ticket allows to enter the park before closure so you can go and wait while they clear the park from day guest and transform it for the night. The advantage is that you'll be released before all the crowds at the main gate and usually are able to knock one or two houses. Probably the only way to do either Stranger Things or Last of Us with minimal wait.
The Express pass allows to skip about half the line. So if the posted wait is 2 hours, you're still going to wait about 1 hour. (Yes, lines will be insanely long for some houses, slightly better week days in September, horrible as you get nearer Halloween)
Also, prepare for a LOT of walking. The entrance for the houses is within the park, but then you have to walk to the soudstages where the house have been built, in the backstage area. For some of them, it's a looooong walk.
The website Orlando informer publishes a touring plan that might allow to visit all houses in one night without Express. It's doable but tough, Express will improve your night considerably. I hate line skipping options, but Express for HHN is the only one I buy.