Selected answers from the Dumb SEO Questions G+ community.
Daniele Zurico: Hi all, I've a new website, my previous pages are only for test. It's possible to reset the site and restart? How?
W.E. Jonk: Can you be more specific? Are you referring to a specific CMS (like WordPress or Drupal)? What do you mean by "only for test" and "reset the site and restart"? ;
Daniele Zurico: Hi, The website is in create by scratch. For test i've created same pages for example: alloggio/Lecce/Puglia/beb-alcentro and other (50 other link). Now i've removed from my site this link and i want to reset the entire site from google and restart by scratch
W.E. Jonk: In general, if you want an internal page to be dropped by search engines you should serve a HTTP 404 (not found) or a HTTP 410 (gone) . Best practise is to use a custom 404, so that users landing on a 404 are not totally lost . However if you move the content from a particular internal page to another internal page you should use a HTTP 301 (moved permanently). With a 301 all the "search value" from the old URL will be moved to the new URL .
You cannot "start over from scratch" nor is there a function to tell Google that you want to "reset" the entire site. The closest thing I can think of is 404'ing every internal page. However there are still corner cases like the root that you cannot 404. For example external links to your home page will still count. Although you can use the disavow tool and disavow every incoming link you might be disavowing "good" links. In theory you should only use the disavow tool for spammy "bad" links. Personally I wouldn't use the disavow tool if you are not sure about it. 
With regard to "test" pages or "test" sites, these shouldn't be in the index to begin with. Therefore it is recommended that you block Googlebot from indexing the site/page. There three ways to block : - password protect - robots.txt - noindex
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Daniele Zurico: Thanks a lot i've implemented the 404. Asp.net for Dynamic page don't return 404 so i forced them. Now i must wait same days and wiev the results