it's like anything else, knowledge, smarts, and alot of hard work are keys, and a little bit of good luck and being in the right place at the right time never hurts either
internet business tends to be pretty consuming, remember, alot of people spend 16 hours a day every day doing something to be successful, especially so for the first year or two.... like any business though, once you have things running smoothly for a couple years it can get easier if you knew what you were doing in setting things up, just like a brick and mortar business... although the internet has alot of change and external forces that can destroy the best laid plans overnight (or in some rare cases blow them up into a billion dollar fortune)
the club and real estate businesses tend to be very people oriented businesses, which is pretty opposite from the affiliate side of this business (being a solitary in front of a computer 18 hours a day kind of thing)... if your strengths are more in the sales and people side of things you might want to reconsider and go hard on something that suits those strengths more
just some thoughts, best of luck with whatever you do
