Just ordered my first humidor!

[Emperor Zurg]

I'm not sure what type of hygrometer it is other than an analog that comes with it.....

Those are notorious for being junk but nonetheless here's what I do...
1) get a Boveda pack of your desired rh. I'd go with 65% if it were me
2) put both the pack and the hygro in a quart mason jar and screw on the lid
3) put the jar in a dark place where the ambient temp does not fluctuate. Leave it alone for a whole day
4) take the jar out and read the hygro inside it thru the glass, noting how far off it is from the pack rh
5) take out the hygro and let it stabilize to room rh. There's no sense in trying to adjust a moving needle
6) once it stabilizes (hour or so should be fine) adjust so the needle moves the number of points it was off. I.e. if the reading was 61% in the jar with a 65% pack and now at room rh, it's reading 42% then move the adjustment so that it now reads 46%. Do it quickly and hold it in your fingertips. Your hands release moisture you know.
7) repeat the jar test to see how you did and don't sweat it if it's off like 1%. It's close enough at that point.

Now I will tell you a better way...
1) season your humidor using the sponge on a plate for a week
2) put in 2 Boveda packs and your cigars
3) throw that hygro away
4) replace Boveda packs when they get depleted