If you're trying to get a WYSIWYG printout of your custom form, Outlook doesn't do that. See http://www.slipstick.com/dev/customprint.htm for various solutions.
You can access any custom property in code using its name: TaskItem.UserProperties("my prop")

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Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.slipstick.com/books/jumpstart.htm
> I created a custom Task and a custom Schedule form with
> custom fields.
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>
> Thanks