Thats true there are tons of things that you need to consider before opening you business, it is difficult thing.
As for me the most difficult part is not planing or money. The biggest problem is taxes and to make your business legal, thats the thing, where you always will have problems.
Many things must be considered before starting a business, the most important is the business that wants to run whether in accordance with the ability or not, meaning that besides the product, marketing certainly involves capital. Is capital of cash or capital credit. Everything must be calculated so as not to stop halfway.