Robert Allen has a mastermind tele-group, a book and a set of CD's on the subject.
I was in his original mastermind group....way back when....and I learned alot.
A few of the areas we made $$ was marketing a product (that we already had....our wassail, if you remember that story) online with a website and affiliates
2) stock options (made $10k, lost 8k, but hey....it sorta worked
3) real estate~ flips & rentals (need some cash for that and lots of patience!)
4) Information on the internet (didn't use that until recently...wrote a book and now generate some passive income from that)
(Real estate....in all forms, information on internet, and stock market are his babies!)