Humidor help needed...

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Hi
I just got my new Humidor a few days ago.Its a humidor that holds between 75-100 cigars.
My question is I only have like 5 cigars left in my old humidor (that i won't be keeping by the way),should I season my humidor right now and put the remaining 5 cigars i have in it Or its better to wait until I have until i get a few boxes to put in it?
Some told me that its not good to leave an empty humidor because it will mess up the humidity,is that true?
I'm going to Cuba in 3 weeks so i will have 3-4 boxes to put in.

P.S. I know every one say to get a digital hydrometer but i just did the calibration salt test for the analog one that comes with the humidor and after 16 hours its at a nearly perfect 75%,do you guys think I'm good for a while Or should I get a digital right away?

Thanks