It's been said, quite wisely really, that it takes 3 years to get your business from 'Zero-to-Hero'. That's if you don't change large aspects of it along the way (if you do, then realistically you have to start counting from 'zero' again).

A good bit of advice, that many experts talk about - if you are going to become an entrepreneur:

• if you are employed full-time, try negotiating with your employer to reduce the number of days you work a week. You could then start setting up the company, doing all the research, networking etc that is needed, without having to worry too much about finances
• if your company won't reduce your hours, this may mean resigning from your job. It does take a while for a venture to turn a profit, so if you don't have substantial savings, it may be prudent to find a part-time job