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You'll probably have better luck posting this in this forum: Network Performance Monitor
Read the NPM implementation guide;NCM and NTA will plug into NPM so your pre-reqs and other information will be from there.
As far as database, make sure that you're running a support SQL version on it.
Changing the db server after install is pretty straight-forward and there is a document that explains how to do it in detail.
We started on a shared DB cluster (VM) but had to move to a dedicated DB server due to our overhead.
The migration went fairly smoothly.
How many nodes will you be monitoring? what type of nodes? How many netflow devices will be reporting?