My nine year old son keep getting migraines and his nose has been bleeding, what does this mean?

Go to Dr. Epistaxis or nose bleeds may be associated to dryness of nostrils but also to rare disorders like vasculitiitis associated to wegener's granulomatosis or goosdpasture syndrome. Migraines are non specific though.
Migraine? Migraine is sometimes loosely used term to describe severe headache. The actual cause of the headache may be something that is not a migraine. It is not common for migraine to be associated with nosebleed. Your son needs to be seen and evaluated to determine the cause of his symptoms. The treatment will be determined by the cause.