For starters, your not "early" at all but LATE. If you want to create a solid Halloween season program, especially a Seance, you should have started a year ago.
This is quite possibly the most difficult mode of performance one could attempt in that it's very easy to come of cheesy or just plain bad. For starters, few of us are as good at acting as we think we are and because we have huge egos we refuse to sit down with those not involved with magic but theater, who can assist us in creating a script, story line, setting and all the proper theatrical elements this sort of thing requires. The other thing you must do is play it "right" for you... that is to say, if you don't have a poker face and have a tendency to giggle, then allow yourself to do an obvious "over the top' character who is a "parody" of sorts.. .think "Elvira" and her dark humor as well as Vincent Price in the old Beach Blanket movies, etc.
On the other hand... if you have never done this kind of thing before I'd recommend that you find existing scripts to proven programs just so you can get the feel of things. Docc Hilford's "From the Mountains of Madness" is most excellent but there are others out there with Jack the Ripper themes as well as several different Seance scripts that are quite solid... my personal recommendation is to start with Paul Bell's "Paranormal Entertainment" and not try to be Lee Earle... if you get my drift.
On the Seance front, go and attend some REAL Seances done by real spiritualists. Keep you mouth shut, sit down and study what they do and how little has to happen. Real Seances are quite underwhelming and even boring for the most part; time consuming and very little in way of dramatic happenings, actually manifests. One of the easiest and most practical to learn is Docc Hilford's "$1,000.00 Seance"
If you just want a macabre stage show... well, there are a dozen and one ways of pulling such a program off but again, you need to know the character and make him solid. I did a 90 minute Rock-n-Roll Macabre show for years complete with burnt sacrifices, impalements and myriad of other gruesome fun... some of it was quite funny too... it has to be. It's still one of my favorite shows in the whole of my career.
