Do I remove the pages from sitea.de after i put in the redirect or leave them up?
Remove them. The whole point is the you're moving them to a new domain. So move them to the new domain and then remove the old pages on the old domain.
Do i have to use a separate redirect for each invidual page or can i do a bulk transfer
It's really up to you. The ideal situation is that if a visitor to your website visits a page on your old domain they will be redirected (via a 301) to the new page on the new domain. You can do this be adding a line in your .htaccess file for every page in the site.
If you have a lot of pages on your site (therefore your .htaccess file would be HUGE), then it might not make sense to add the pages to your .htaccess file.
the urgency of maintaining rankings are not as important at the moment
It's always a difficult task to move domains from one to another. Since rankings aren't a big concern, then redirecting the entire domain may be sufficient. The spiders will reindex the new site and the new pages will get into the index.
concerned about is the link popularity
When you do a 301, all your links from the old domain are credited to the new domain. So, there really shouldn't be a problem. You'll want to notify everyone who's linking to you, though, so you can tell them the new URL.
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