I know this can be overwhelming....if it were me, I'd get this:

1) 100 Count Humidor - CLICK ME

2) Aluminum Humidifier 65% - CLICK ME

2B) A tube would work fine too, it'll just take up room. 2 Ounce Humi-Tube

3) How To Setup Your Humidifier - CLICK ME

3) Digital Hygrometer. When looking, I'd check the guaranteed accuracy.

4) Calibrate Your Hygrometer - CLICK ME**

** Note, it may not be recommended to do with a digital hygrometer (I've heard mixed results of the salt test possibly messing up the digital hygrometer).

There, all the work is done for you.