Does anyone know how to make a domain to point at my (blogger) blog?

it depends on where your blog is located.
If you have hosting for your domain then you can make a domain redirection.

You can use a basic html file (index.html) located at the site root to forward people directly to the new site.

You can forward them by either a metatag link or javascript. Usually forward using both methods just incase someone has javacript turned off in their browser.

-Good luck.