OpenCore beginning questions (offline vs online etc)

So I just ordered a new computer to turn into a Hackintosh.

I ordered Win10 with it, just in case.

But I also have an actual (from around 2006 I believe) Mac Pro running 10.5.8 (not sure if it is able to upgrade to a later version). Can I use this for the OpenCore installation setup etc?

Or do I need to install Win10 on the new build and use that for the setup.

submitted by /u/massro
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