I believe it all starts off with passion.

You are either passionate about what you do or you are not.

To be honest if you are not passionate about your job and where you work you probably should look elsewhere.

I help run a competition called the Grand Idea which is similar to Dragons Den.  Students present business ideas and you can quickly see who is passionate and who is not. 

Try presenting your business idea to someone and ask them if you sound passionate about it.

It is well known that successful entrepreneurs are passionate about their business.

You can easily see if someone is passionate - it radiates from them.