Wanna know how to make money quick? Build a paid subscription web site where you offer an online community for your target audience. It could be a message board, chat room, web cam chat.
You could set up a paid subscription web site where you offer a regularly updated directory of resources for your target audience. It could be web site links, free stuff, ebooks, ezines, etc.
Publish a free E-mail newsletter to charge for no ads - You could publish a free e-mail newsletter and charge a subscription fee to people who don't want to get advertisements in every issue. Free subscribers would get ads and paid subscribers wouldn't.
Create a paid membership web site where you rent either physical services, online ones or digital products. The software ones would be limited to their membership and turned off when it terminates. People sometimes would rather pay-as-they-go than pay a large price to hold a package. A backend might be developed with the original seller. Get permission if needed.
Set up a paid subscription web site where you offer a new product every month. You would create or buy a new product to give to your members every month that related to your target audience.