It is the oil that greases your way to success. You'll need money to support yourself and your business. You'll need to consider the money needs of your potential clients as well. You'll want to arm yourself with some tools to do this. Of course, the first place to look is your own personal assets and resources.
Nothing is better than money in the bank.
A nest egg that will carry your for 6-12 months is ideal. But many of you are not anywhere near that. You can turn to friends and acquaintances for help. Frequently they will be glad to offer some support. But keep in mind that this is a good way to strain these relationships.