My family has been doing that weekend for the past several years, normally we go Sat. and Sun. I dont know how the park is on Fri. evening, but I believe it will be very busy, with people coming in for the weekend. Historically Sun. has been pretty slow and a great day to get on rides with short lines. I am assuming that since you are going during Halloween weekends that you plan on doing the haunted attractions.
This is how I would do Fri. Get in line for Cornstalkers by 7:30, this is an outdoor attraction and tends to get long lines. Cornstalkers empties out just inside Manical Mechanial Screamworks so walk through that. From there head over to Blood on the Bayou, this is an outside attraction that has a very short to no line, then head over to Terror Island and Carnevil, they are right next to each other. From here I would head to the front of the park and do Erie Estates then Fear Faire and Club Blood. That leaves Happy Jacks and Club Blood left to do. With the exception of Corn Stalkers the outside haunted attractions do not have a line, Terror Island might have a small line, but it moves continuously.
If you do not get to Happy Jacks or Eternity Infirmary on Fri. then plan on getting in line for them just before they open on Sun. at 3pm. The line for Eternity Infirmary tends to get long fast and stay that way the rest of the day.
Sun. tends to be a great day to do the rides as the park is less crowded. With early entry pick your favorite coaster and head there 1st on Sun. my family loves Maverick, so we normally head there 1st ride it twice and then go to Top Thrill.
If you plan on heading to Maverick or Top Thrill 1st park in the back in the parking lot for Soak City, this will put you ahead of the people entering in the front of the park.