About order management in wholesaling

Hi everyone

I don't know if this post is appeared in the proper forum. However, I can't find any suitable forum than this

I am intending to open my own small wholesale business. I'll wholesale food, fresh food and fruit. There's a thing that i always wonder that how we get order from customer. I asked my friend and she suggest me to buy a order app so our customer can easily order and we can track the inventory easily. But I don't know if it's neccessary or not? And how much it cost for us to buy them

Thank you guys