You do not need to purchase the Authoring Kit to add content to an existing game system.
Within each game system, there is an editor (Tools menu...Launch Editor) which will hopefully guide you through the process - without that, you'd need to figure out by trial-and-error what fields and tags existed, and what values you can define for each.
Also, once you open the editor in Pathfinder, you can use the help menu there, select the first option, and you'll get the game system-specific editor manual.
|