How do you optimize your Ad Spend on a brand new product?

I’ve just gotten my first product up on Amazon and completed all the steps for a “Perfect Launch”. The product has been active for about a month now.

I’ve been experimenting with ad campaigns with Amazon PPC, Instagram, Facebook & Google and have spent an obscene amount of money. I am getting about 1 order per day on average.

I’m wondering how others organize their PPC for new products, how much you budget per month and how long it takes until you start seeing a return on investment on average.

I am in the dietary supplement category.

Thanks in advance!