301 redirect for dynamic site

[b2bseo]

I've learnt a lot on 301 over the last few days and have started implementing it but I am stuck when it comes to doing it for the internal pages which have ?id=xyz structure, as briefed below:

Old Site
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It has pages like www.olddomain.com/xyz?id=543

New Site
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It will not have pages with the ?id=xyz. So the new site has different structure.

I want to know how should I do the redirection for the internal pages, other than the home page. My site is hosted on windows. Where should I write the code for 301 redirection?