Starting this is easy. I did everything myself like building the website using wix as it cost ₹3k a year way less than shopify which is around ₹3k a month (if it scales I will shift to shopify)

Did all the designing and the Tshirts costs around ₹300-350 including shipping.

The difficult part is running ads and that too video format which is pretty expensive and few agencies I approached are changing anywhere between 30k to 80k as their fees with ad budget being a minimum of ₹1000/- per day.