The first thing you can do is to test the demo (see section A Sample SFgate Application). You find it under:
When submitting a query, your SFgate is called, which contacts to the freeWAIS-sf server on `ls6-www.informatik.uni-dortmund.de'. You can select from three databases and use some of the search configuration options, e.g. language selection, verbose headlines, multiple choice headline menus.
Then you can try a server search (see section 5.6.4 WAIS Source descriptions):
The next step is to build your own SFgate applications in order to offer your databases.