Errors creating my first database

I have been trying to get started with PostgreSQL, and
it hasn't been going
well.  I installed, ran initdb, but when I try to create
a database with
createdb I get an error that "username" does not exist.
OK, so I try to use
createuser to create the user name and I get a
different, though equally
frustrating, error.  I have shut down my Linux box out
of frustration so I
can't tell you all the exact error, sorry.  One of the
errors I am getting
is about a locking file that I don't have permissions
for.

Obviously I am doing something wrong here.  I have read
and re-read the
Tutorial, User's Manual and Admin Manual, tried to
follow the procedures in
the manual, but no luck.

Could someone please help me get started here.  I am new
to Linux and part
of my frustration is that all the manuals assume an
intermediate level of
experience with Linux/UNIX.  I don't have that and at
this rate I can't see
that I ever will.





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