Dumb SEO Questions

(Entry was posted by Lukasz Rogala on this post in the Dumb SEO Questions community on Facebook, 04/19/2014).

I need your help my SEO brothers :) I have four questions ^^

I need your help my SEO brothers. :)

First question:
My client has 15 domains for different regions (.com, .co.uk, .fr, .lu, etc.).
Is it possible to give Google a signal that domain.de is the correct version of my site for users from Germany? Should I use hreflang for that? I know it is just a suggestion for Google.

Second question:

Is it good to redirect users from default english version to .de domain based on their user-agent info or IP localization? Should I use hreflang then? Sometimes people in Germany google things in english, so I don`t really know if I should do that or not. For example I`m looking for some usefull information about hreflang attribute in Google.co.uk but I use Polish language as a default. So that - when I pick a result the site is redirecting me from .co.uk domain to .pl.

Third question
We got some domains in German (etc. DE. CH.) in the same language. How do we avoid duplicate content? We can`t redesign the content - no time for that. :(

Last question (rly!)
We got multilanguage site for Nederlands because there are 3 or more languages in use. So on .nl domain we have to provide information in fr, de and nl. Will hreflang work fine then?

Thanks for any information. :)?
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