it depends... if you are shooting custom stuff, i would say you will need to do 8 shoots or so... minimum $2000-$2500 for content alone.
plus other costs...
use an AVS for hosting and billing to start - they take a flat % of sales, and no overhead for bandwidth or space.... good way to start free.
ProAdult - Best AVS
Sign up there - their Quantum program can't be beat for monthly rebills!