How do people start a business lol

So I have an idea of starting an abaya business…
I have the concepts/designs ready.
I know where to buy the material.
I have a tailor I usually go to do my clothing— but I just can’t imagine a singular person creating a bulk order of abaya’s.

Does anyone know the process business’ usually do to create like a batch of abaya’s of different sizes?

I’ve made abaya’s for myself during Ramadan and I always get so many compliments! I think people will really like the designs as it won’t be the typical ones we usually see… it’ll be fun and cute! Thank you in advance 🥹🥲🩷