Good toknow that u r quick lerner. Pls. do one thing.
You may get some good demo programs on OTN. But i am not sure whether u will get for forms6i. But u may get for forms9i.
This should be a good starter for you...Or just think of a prototype application conatining few forms & report and start building. FOllow on-line docs. & keep goind ahead. I followed the same path and now i have develpped at least 5 application conatining approx. 400 forms & 150 reports. All are working fine.