Fashion design

Looking for someone who can design by request a few clothing designs for Magnus Clothing. We are a start-up that looks to sell own designs, second hand clothes and other brands clothes.

For every sale we have we will be donating to an ONG in Colombia/Venezuela.
I'd need someone to help me out now and probably in a long term partnership to design clothing for our brand.

Our market should go from kids (0-10) and for teenagers, young adults and "I want to live forever" adults. So age range would be from 16 to  35.
I'd love to hear your proposal and if you're interest I'd love to know the cost, either per hr or total cost after the work is done.

Just FYI: Please be advise I'm looking to receive 5 - 10 designs each project. From shirts, t-shirts, to dresses.

Thanks