It can take longer then 1 week for changes to show up in google webamster tools.

Depending on the age of the site, it can take anywhere from 2 - 4 weeks for the changes to show up. The older the site the better, changes will show up faster.

As for the sitemap, what content management system are you using? Some CMSs have a built in RSS feed. You can submit the RSS feed to google as a sitemap. If you want a real sitemap, you will need to make sure the CMS is generating a sitemap.