Yup. They're in the same folder as site  templates. They're all marked as
SPSxxx (e.g. SPSNEWS, SPSTOC, etc.)

How do I start a new custom page.

Yes - just create a template  in the normal way but make sure its folder
name begins with SPS. There is an attribute on each entry in the
WEBTEMP* file that indicates whether the template is also shown when you
create team sites so if you set Hidden=TRUE it won't appear there and
will only appear when you provision an area.!

See the existing templates  for a sample of what I mean and also refer to
the SDK as all of this is documented there.

I read that in the Customization of Portal sites...but
it sounded that it can make alot of templates  not just
one...??
Am I correct that a number of templates will show
up???

I want to make specific templates for let's say
vice-president
and another for directors...will this give me the
option to do that???