Hard to give promotions or marketing advice without knowing what type of business you are asking about. Can you provide a bit more information about the business you would like to promote? Product or service, markets served, etc.?
Identify Your Goals. Before even considering following a career route, you must get to know yourself. Build a Professional Resume. Become Aware of Your Strengths. Assume Full Responsibility for Your Life. Always Raise Your Standards. Brand Yourself. Network -- A LOT.
Go beyond the business plan. Test your idea. Know the market. Understand your future customer. Establish cash resources. Choose the right business structure.
Please elaborate the type of business you are in ? Tim mentioned very rightly do consider about building a good team as well its also important.
I'm going to provide some general tips that apply to most businesses. Good copywriting is an important aspect that is often overlooked and has a huge impact on conversions. Having multiple traffic sources is also important because if you put all of your eggs in one basket or into one traffic stream, you can lose your business overnight. List building, or finding a way to get your visitor's contact information to follow up with them is another important aspect. Most people do not purchase on their first contact.
Have a burning desire. Back that desire with faith. Have a precise goal. Fuel your mind with good books. be positive. (This one is very important) HAVE AN ORGANIZED PLAN, by which you'll fulfill your desire. Always remember this quote: " A winner never quits, and a Quitter never wins."