Trying to create new fcp effect with Quartz Composer

Hello guys,
I bought FXFactory and a few of the extras for myself a couple of months ago, and then bought another two of all those for my workplace (Tequila London)... so I am now trying to harvest the potential of the customising FX...

I have created a basic composition in Quartz Composer, it has an input connecting to an image transform box connecting to the Billboard.

When I open it in FXFactory to create a new plugin, it says there are no published inputs or outputs or something like that. When I save it anyway, then try it in Motion, it only has one parameter, MIX.

Im a pretty bright chap, but this is incredibly difficult, or at least, very unintuitive! Is there a beginners guide to create FCP and Motion Effects using quartz composer you could point me to, all I come up with on the web is stuff to make screen savers etc...

Thanks
Mark.