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Thank you for the fast response, indeed I'll better use fresh content. I was wondering if using content from archive from my old domain would not lead to punishment from google. Thank you! Kind regards, Menno

Thank you for your fast reply. The old domain name is a .nl and the new domain is a .com in my country .nl ranks little better than the .com. So also this will count, but i also think ill do a 301 redirect from old domain to new domain. I might help a little, it has indeed been expired. Though it is old and still has PA and DA. Kind regards, Menno ps. i made it discussion because i am also curious on other opinions

Glad I could help and give you something to think about - I would definitely think about 301 redirecting one site to the other site and push forward with building one great information resource for customers new and old..

The social proof wont be the problem. Ill give the products for free to my customers, to download directly they have to Like or Tweet otherwise they need to wait 30 seconds. But will the RSS update benefit my rankings in Google you think (long term)?

I echo what Ryan said 100%.  Another suggestion - especially because it sounds like you're going to start with a whole bunch of info - is to add a blog.  When you're building a site, especially one that has a whole bunch of info go live at once, is to stay focused on fresh content. With my businesses' sites, I've really found that pushing content all at once during the launch gets me indexed, but doesn't necessarily get me the SERP position I want.  I try to write two articles a week per website at a minimum.  It keeps the crawlers coming back and increases my site wide keyword density and potential for catching long tail searched.