[Zope] Writing a product

Hi list. I want to find some step by step reference about how to write a new product. I have found some how-tos, but I still feel completely lost. Everywhere I look, I see Zope specific function calls. Does any document exist containing product-API specific stuff that could aid a Zope little-above-newbie level developer? Thanks for your time and I apologize about my newbieness Regards Stavros.