Hi, Hb.
Nashville tuning can be either standard or dropped D (or even open tunings, I guess) ... the only difference is that you tune the bottom 4 strings (bass) up an octave. Obviously you couldn't do that with normal stings. They'd pull your bridge off before they'd snap, so you use gauges that suit. You can tune a normal D string up a tone to E without too much trouble, so use a D string for the bass E; a G string for the A;, a B string from a 'heavy' set for the D (that would mean tuning it up a minor third, from B to D) and use a light gauge top E string for the G, another minor third tune-up. Experiment a bit if necessary ... you just need those 4 bass strings to be an octave higher that usual to get that jangle.
If you're used to standard, tune to standard eadgbe; if you want dropped D, tune to dadgbe.
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