Bill through two processors and a dialer/900 option. Make sure you have Euro-billing options (hagan //at// 2000charge.com is a good reference). Checks, I would say ignore. You may make 20% more but you'll spend it all on advil and liquor once you see the return rates, unless you get a solid solution in which case you still spend money on those two waiting for signups that are valid to happen...
Webmaster/affiliate program software, best not to stick with one processor's solution but create your own (x3scripts is decent for this)
Negotiate hosting with a host who has references, check their responsiveness via ICQ/phone/etc. (Recommended : xxxwebhost.nl)
If you're not good with UNIX/Linux, find someone who is (you can ICQ me 92621238 if you need info) for at least a bullshit detector and more a consultant to get your stuff running smoothly. Setting up payment processors can be a bit interesting.
Set up your members' area using PHP/SQL so you can make sitewide design changes with just a few files and not hundreds of HTML files (I can help with this too)
Site translation into at least two or three languages (
http://www.adultpornbiz.com/ is who we used, great service)
Plaster USC 2257 notices like banner ads on a TGP from 1999
Go with one or two live feeds matching your service. One boosts your retention, beyond that it's a crapshoot since often live/voyeur feeds go downhill after a few months (vs.com has good stuff)
Subtle upsells to sex stores, video stores, etc., in a shopping section
Boost your content base with either plugins (iffy) or bought content (Ounique is a good source). You don't want someone to run through the entire site's content in 24 hours.
My
-doug