A hosted Filemaker database using Instant Web Publishing means the host is running Filemaker.
The database is uploaded (usually with a special FMP remote management control panel) and runs on the hosting server running FMP Server Advanced.
Filemaker Pro and Filemaker Pro Advanced can host an IWP database for 5 concurrent users.
Filemaker Server Advanced can host an IWP database for 100 concurrent users.
There is an option called Custom Web Publishing which is very sophisicated and requires deep knowledge. see http://fmwebschool.com
Some people use FMP to create static web pages containing the database information.
You need a computer (Mac, Windows), Filemaker running on the computer, IWP sharing turned on for the database, a fast internet connection.
You can not do it with what you have.
For more on web publishing, see the "Instant Web Publishing Guide" that comes with your copy of FileMaker Pro. It can be opened by selecting it from "Product Documentation" in the Help menu.
I am correct in thinking that you need a static ip address to publish with IWP? To clarify I mean publish on the WWW and not on a LAN
It's a good option, but if you research this, you'll find that there are services that can be used to compensate for the lack. Consulting with your ISP before you publish is a good idea anyway.
So in summary my choices for putting a database on the web are:
a) Pay a web host with specialist expertise and software for Filemaker
b) Become a web host with specialist expertise and software for Filemaker
Is that correct?