2.) Assess your level of enthusiasm: In other words, really ask yourself whether or not you will enjoy (almost) every aspect of your business venture. In the beginning, you will be putting in long hours with very little financial return. So you better be sure that you enjoy what it is you are doing, otherwise you'll never stick with it.
3.) Don't quit your job... yet: The goal would be to one day generate enough income from your own business that you would no longer have to work for someone else. But this could take years, if it ever happens. You will need to put in some hours after the kids are in bed, on the weekends, over vacation, and whenever else you can find the time. But do not quit your job in anticipation of making money right away.
4.) Keep your overhead low: Throwing your life-savings at a new business venture provides no guarantee that it will succeed. Be strategic about where you spend your dollars on product, training, advertising, etc. You need to be able to "afford" your business because in the beginning it will cost you money. So exercise restraint and don't fall prey to marketing schemes, advertising deals and consulting services that promise results for a hefty sum.
5.) Slow and steady wins the race: Make sure that your goals and expectations are realistic. This is not to say that you cannot have plans for major growth. But this rarely happens overnight. Each sale you make is one step closer to realizing your dreams. So take things one day at a time and celebrate small victories along the way.