Welcome to cigars!
About humidors. My first one was from Thompsons. One of those promo deals, where the cigars were crap, but the humidor was ok.
You will need to get some Propylene Glycol or "PG" The best place to get this is from a pharmacy. Usually a pint will be about $9.00, and will last you many years. Secindly some "floral foam" this can be had from a crafts store $3.00. You need the kind that absorbs water. Third a digital hygrometer, although a analog is cheaper they aren't as accurate. Try this place
http://www.cigarbid.com
Make your solution at 50/50 to start, cut a small square of foam 2"X2"X1/2" place this in a plastic dish (travel soap holder works great)
This should put you at 70%, add or subtract the floral foam as needed. Less PG gives you more humidity, more PG gives less.
PG is pretty cool stuff. It has the properties that will add humidity to the air when needed and absorb as needed...depending on the size of foam.
As you progress with cigars you'll find that 70% is a bit much humidity and will want to drop to about 67%. I find that this is the ideal for my cubans. This winter you'll need to keep an eye on humidity levels, as most homes "dry" out, and the opposite occurs in summer.
Even though I started out with a promo 25 ct desktop humidor I now have a 300 ct desktop, 2 cooleradors and a dry box...
Enjoy!