Can we create our own error page? If so, how would we go about doing it?
You sure can!
Just put a file called missing.html in the main web directory for your site! (this is for 404 errors, file not found).
You can also make custom errors for:
401 errors (failed auth): failed_auth.html
403 errors (forbidden): forbidden.html
500 errors (internal server error): internal_error.html
Alternatively, you may also add a line or two in your .htaccess file:
ErrorDocument 404 your_custom_error_page.html
Similarly with other errors e.g. 401, 500, etc.
Alleged Cybersquatter - knows a thing or two about domain names