Publisher produces fixed width pages that are left justified. Unless you are
using Pub 2000, there isn't a good workaround. However you can reference
this page for how you can simulate a centered page: Understanding background
padding in a Publisher web (aka white space) :
http://msmvps.com/blogs/dbartosik/archive/2006/01/07/80563.aspx

As per your uploading challenges here are a whole group of links about the
subject, and don't forget to read the instructions in the FAQ section of
your webhost.

David Bartosik's articles about uploading:
http://msmvps.com/blogs/dbartosik/archive/category/1921.aspx
Unless you are using forms on your website you can use FTP uploading
protocol. If you are using forms HTTP uploading will be required. There is
also a troubleshooting article.

Prepare, publish, and maintain your Publisher Web site:
http://office.microsoft.com/en-us/publisher/HA011053521033.aspx

Three top questions about publishing a Web site using Publisher 2003:
http://office.microsoft.com/en-us/publisher/HA011186811033.aspx?pid=CH063577001033

Troubleshoot publishing Publisher Web sites:
http://office.microsoft.com/en-us/publisher/HP062535831033.aspx?pid=CH063577001033

DavidF