Merch By Amazon T-Shirt Designer

I need a T-shirt designer to research good niches for Amazon and design the T-shirts. I have the potential to have 400 shirts so $3x400 would be $1200

You must be able to speak English (you don't have to be fluent) and be able to research shirts that will sell well while not violating copyright. This is very important. I need original ideas for T shirts that will sell and are designed well.