Most people think that they would have no difficulty in starting and running a business if they had lots of money. This is not generally the case. There are many examples of rich companies failing. Starting a business is not about money. It is about hard work, determination, long hours and flexibility in relation to the market place.
Money is a function of running a business.
It is not the reason to start a business neither is the lack of it the reason not to start a business. So you have a business idea. The simple advice is to test this out on paper before you hand in your notice at work and start laying out cash. The business plan is a necessary grind. The business plan is a useful device.