First do this
to check your seal and make sure you have a good seal. Then use a only barely slightly damp towel or rag to wipe the interior of the humidor to make sure you don't have anything in there that might affect the taste of your cigars. Then finally follow this guide
on how to season your humidor. You want to have a hygrometer that is calibrated prior to this, so get a good digital hygrometer (I like the Xikar circle ones, but any digital one should do), and do the salt test
for it prior to seasoning your humidor so you know your humidity. Finally, while seasoning your humidor order beads at 65% RH from either Heartfelt
and then you'll be good to go.