Originally Posted by karina.b
Hi seopeak,
The best way to transfer your current site's power to the new site is to use a 301 redirect. You only need to use the 301 redirect, you don't need to no-index the old pages. In fact, I wouldn't recommend no-indexing the old site just yet. Search engines will need to crawl the old site in order to see the 301 redirect to the new site. The search engines will then start indexing the new site, and de-indexing the old site. Keep in mind that it takes time for search engines to crawl your pages, so you may still see some pages of your old site in the index, but don't worry, these will eventually fall out. Also, if anyone does happen to click on a page from the old site, they will be redirected to the new site anyway, so you won't be losing any visitors.
If you have pages on your old site that you don't also have on your new site, you can either redirect those to another relevant page on the new site, or you can 404 those ones out.
Good luck! :-)