[QUESTION] Any advice or tips concerning getting preorders?

Hello, I have a question that has been on my mind for the past few months.

1- How do you go about preselling/preordering from customers before you order in bulk, in other words, how would I go about getting preorders for a brand?

The reason I am worried is that I don't want to order in large bulk and then have to worry about getting rid of the inventory.

Any tips or advice?

I am planning on going into the food niche.

Thanks!