Many of the things that cause ghosting are out of your control. The two things that can be controlled are the stacking procedures of garments and the choice of ink.
Stacking at the end of the dryer can be performed safely by having multiple stacks going at once. If you allow one stack to cool as you place garments on the other piles, you will avoid one of the elements of ghosting.
Proper ink selection is the very best deterrent for ghosting. If you intend to print on 100 percent cotton garments, choose a white designed for cotton. If you are printing on 50/50, the chances for ghosting are greatly diminished, yet the condition may still occur, thus a peroxide white is your best choice.