VPN's: where do I get started?

I need to setup a VPN.
Where do I get started.
I know nothing about VPN's - I've read about what they
are, but know nothing else.

Where do I start?  Are there any websites that I
should visit?  What book would be recommended?

What OS should I go for?
WIndows?
Unix?

I've been told go for Unix becuase then you don't have
to pay for the licenses.

But, with Windows, surely I'll be able to get more
help easily becuase mroe people use it?

ANY help would be appreciated.

Thanks.


Jam

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