Welcome to the site.
A lot goes into choosing a humidor and even more into converting an existing box into one. A few people mentioned several cheap alternatives like Tuppadores. Always a solid option. But if your heart is set on a humidor then here are a few suggestions
First size - take the metric conversion approach, figure out the number of cigars you think you would like to have at home, double it and add 32.
Second, start saving for humidor number two.
Take time to season properly, don't hurry. If you need them I have some pre moistened wipes I would be happy to send
Invest in a good digital hygrometer
If you decide on a smaller size just use Bovida packs to control Rh. Super easy, rechargable, inexpensive, dependable
But really you can get a decent humidor for a low priced on
cBid.com. You can get smaller humidors (25-50 cigars, although it will really hold 25-30) for under $40