Mold is not a problem unless you live with it daily, or have respiratory problems. You should empty everything out, open all doors and windows and then clean every surface with a bleach based solution. What do you think the mold remediation guys use..... You could wear a mask if it would make you more comfortable, but ventilation is the key. Once you have air movement and dry the interior out from condensation, the mold will begin to die. If you close it up again, make sure you have a dehumidifier running or do something for condensation. Running your air conditioner once it is cleaned will help remove any additional moisture.
