The first few things any instructor should do before teaching a women's self defense course are:
Read at least 3 books on the subject
I disagree. There are very few good books on any sort of self defense, and most of them aren't specific to women's self defense. Assuming your martial arts training has been realistic and oriented towards real world application, you'll be fine.
Contact local womens shelters and talk to them
Again, not a reliable or effective source of information. The problems that lead women to a shelter are not the same ones that will require self defense. There's overlap... but the women who wind up in shelters almost certainly need a lot more than a self defense class before they defend themselves against the greatest threat to their safety.
Speak to women you know about the kinds of things they are worried about
Not a bad idea, but do some research accompanying this. Find out what they're concerned about, and why... and what they SHOULD be concerned about. For example, statistically, most women are not likely to be the victim of a stranger rape or abduction; it's much more likely to be someone they know who attacks them.
Attend a few similar courses
This I agree with. But probably for a different reason than you listed it. See what people are teaching. Most of them won't be teaching something useful in a useful manner.
If you're really serious about teaching self defense classes, I encourage you to look for some of the solid programs that use good teaching methodology for the subject matter and the learners, and get certified through them. If you're just looking to do quickie classes, either as an intro to your program or at the occasional request of community groups, then develop a reliable curriculum.
My wife is currently enrolled in a "self defense" class through her college program, to meet the PE requirements. The guy started out poorly prepared, and haphazard, but has improved. But what he's really doing is an intro to his martial arts program, not self defense. A few articles and notes on avoidance and awareness aren't the same as actually teaching that aspect -- which is where the greater emphasis needs to be. Self defense is not the same as martial arts; martial arts are not immediately self defense. And many martial artists, while very skilled at martial arts, are not skilled at all in self defense.