Information request: Developing a plugin, the basics.

I'm having someone developing a plugin that I designed, he already integrated its functionality to the forum but now he needs to convert it to a plugin, we need to know how do we do this, is there any direction that you guys can provide to other threads or to webpages containing this information?
I sent him these:
Framework manual: http://www.woltlab.com/downloads/manual/wcfdoc_en.pdf
https://github.com/WoltLab
https://github.com/WoltLab/WCF/wiki/Development
https://github.com/WoltLab/WCF…Creating-a-simple-package

Is there any other links or information available on how to develop a plugin for this forum software?

Also, just to have it here, what are the basic programming skills and knowledge needed to develop a plugin for this forum software?

Thanks.

Are those links I posted all there is regarding information on creating plugins? I need help here...

I asked my guy for more details, should be back with them tomorrow, thanks.

Seems like they figured it out, thanks a lot.