In this documentation we'll cover everything you need to make your own Vorple games, apart from Inform programming itself.
Vorple supports both Inform 6 and Inform 7. Despite having the same name, they're quite different systems, Inform 6 being a more traditional programming language and Inform 7 a more modern version with English-like syntax. Both systems are equally suitable for use with Vorple, and the choice between them is up to individual preference.
Inform 6 is available at inform-fiction.org. Inform Beginner's Guide is a set of beginner level tutorials and the often praised fourth edition of Designer's Manual aka DM4 goes through the system more thoroughly. Inform 6 has currently better support for making games in languages other than English.
Inform 7 can be downloaded from inform7.com. A good place to start is the built-in manual, other documentation is also available. Inform 7 is the most popular system for parser-based games and easier to get into without programming experience.
From now on we'll assume that you know at least the basics of either of those languages and know how to create a simple playable game.