Open up any current system. Click Develop and make sure "Enable Data File Debugging" is checked. And then select "Create New System". Then switch to your new system.
Then go here:
http://hlkitwiki.wolflair.com/index.php5?title=Home
Read through Basic Concepts, Advanced Concepts and Kit reference. Then go into the Examples section and see the "Savage Worlds Walkthrough" do that before you start working on your own system. I'm just making the assumption you have very little programming knowledge so make sure you watch the order things are entered into the files.
While going through the walkthrough come and a) search for issues you're having and then if you don't find the answer b) post a question. The searching part is very important because lots of things have been answered many times.
After all is said and done, make another new system, but this time for what you want to do.
The authoring kit is not for the faint of heart, it takes a lot of time and work.
Good luck.