It's probably just too big a subject to try to distil into a newsgroup
post (although I'd still be intrigued to see if anyone can provide a
succinct and reasonable answer).
I would look for a book with a title such as Beginning Object-Oriented
Programming with VB5 (or VB6 or perhaps even VB4). You ought to be
able to find something at your local library or hopefully cheap
online.
I don't know where you're located, but there's a listing on Amazon UK
for Deborah Kurata's "Doing Objects in VB6" at £0.59. Which seems
reasonable.
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