How to select online biz

Every day there is ten or may be hundred online biz born or even reborn? Just how can we pick the "right" oline biz? Big Question. I have join many online biz since 3 year ago. I tried to find wihich one is really free. The result none ... nothing ... zip ... You can see list of links on my Adsense Website or Photos Collection even on Blogspot , all of them full of advertise. In return what I have ... Just cent of dollar or just the biggest one bellow $40. So what should we do? Invest more money or try and try again? Today I join vortexmarketing they say is free and yes is free no need to upgrade, just follow the instructor. I hope this my final searching so I can concentrate to one or two online biz only.