Fernando:
Web Connect comes with its own ISAPI connector (wc.dll) as you point out but the product is primarily a framework (and an excellent one). So why would you go the FoxISAPI route where you still have to do almost everything yourself when for a little amount of money you get a framework with full source code?
I would suggest you visit Rick's board where many experienced users can answer your specific questions. If you want to see many sample apps written with WC, go to a search engine site and try wc.dll. As an example I'll give you three: UT, Fox.Wikis and Web Connect's support board.
You may also be interested in attending the Web Connect chat (in Spanish, so it should not be a problem for you) that I will be giving soon.