[Zope] How to use the manage_add - methods

I am a very novice zope/python user that needs to become an expert as soon as possible, since my whole dissertaion is based on Zope/Python. I have read all documentation availible on the zope.org site but can't find the answer to the following... 1. To run python scripts written as dtml methods. Do I simply use dtml-call from another dtml document/method? 2. To create folders, mthods etc in the code. I have found some functions manage_addDTMLMethod, manage_addFolder, but how do I use them? 3. I need to make a site that allows users to register ( i.e. to generate user folder with some standard documents in them). Anyone have hints regarding this? (or in fact a whole application I can use?) I appreciate any kind of contribution, Espen