You should seriously consider purchasing the HHN Express Pass. It will save you quite a bit of time then standing in the regular line.
The Wolfman, Dracula and Frankenstein have entrances near each other, and all three exit out into the same location. The Wolfman entrance is near the Jimmy Neutron & HRRR rides. The Dracula entrance uses the Twister entrance. The Frankenstein entrance is between Twister and Revenge of the Mummy, near where The Ghostbuster outdoor show used to play. All three exit out next to the Twister store.
Leave it to Cleaver is located next to the Beetlejuice stage, which is being used for the Rocky Horror Picture Show. Saw is located next to the Fear Factor stage, which is where Bill & Ted's Excellent Halloween show is at. Make sure that you don't go to either of those two houses as the shows are letting out, as the crowds leaving the shows will usually flow to the nearby houses.
On the other side of the park are The Spawning, Chucky and Silver Screams. The entrances to Silver Screams and Chucky is near the ET ride, while the entrance to the The Spawning is near MIB. However, Silver Screams exits out near the ET ride, while Chucky and The Spawning both exit out near MIB. In my opinion, out of these three houses, you should do Silver Screams first, which will exit you out near the entrance to Chucky. Do Chucky, which will exit you out near the entrance to The Spawning. Then do the Spawning. Doing this in that order will cut down on the amount of walking time.
If you want to do Bill & Ted's (and you should because it's pretty funny), and have purchased an Express Pass, you can use it on the first show only. If you get in line a 1/2 hour early with express, you should get very good seats!