Design labels and boxes for cosmetics

Hi. We are launching a new range, we are looking for a designer to help with labels and boxes, so must know printing criteria such as bleed area. There is currently 3 product packaging to design, it is thought that the first one will be the main project, the others will be variations on that theme with just changes in the wording. So please give a price for
1 - master design of boxes and labels
2 - price for variation of the box and label design

If you need any further information, please ask. The products are still in the conception stage, so there are no limitations at the moment.