I always taught that in making a good business, one should make good business plan first, because if you don't, there's significantly higher potential that you are gonna be wasting your business.
you should make certain planning in regard of man power in running your business and there are operational costs need to be think of, this is most certainly not just for random people, business take good efforts in getting it to succeed, even then only very few of them could actually gain success, if you truly want a to start a business you should know before hand that the chance of bankruptcy is higher than success, it's like 1 out of 1000 business just gonna go bankrupt, what you see on the surface, all those good business making trillions every year, only very small fraction of business ever existed.
The basics should be covered first, so you won't regret later on that you skip those parts.
So yes, a potential good business should have a good business plan in the first place.
You can't just start without any planning at all. If you do that, it means you will be bound to failure.
Remember, that's your money on the line. So better secure it by meticulously assessing the components of the business that you want to create.
Also, you should not rely from someone about the vital aspects of the business. You will be running blind if you have little to no idea of what's going on with your business.