Building a successful business requires tending to many disparate tasks and areas. This need to be good at different skill sets is one reason it is hard for many to succeed at their own ventures. Bring in consultants to support you in any areas that you don’t have expertise in. Consider this short list of key areas to tend to:

Your content. What you sell, whether it be product or message. Make sure it is clear, relevant, useful and inspiring.
Your self. You are the face of your business. Care for and tend to yourself. You are a walking billboard. Keep that in mind in terms of how you present yourself.
Your audience. What good is a great message/product if no one knows you exist? Focus on building your fan base & database.
Marketing. Includes online, print, PR, advertising, etc.
Design. Makes a big difference, especially in this day of urban, aesthetic-savvy consumers. Get help.
Branding. This matters a great deal. Your brand should be easy to understand and memorable, both linguistically and visually. Don’t muddy the waters with too many names for what you do, divisions, departments, groups, etc. Keep your name and mission focused and in front with everything you do, in-house and with the public.
The technology side. You need to have an effective web presence and consider using technological tools to assist your business. This use of technology goes beyond the typical website. It includes software, analytics, algorithms, information capturing, automating processes, etc.
The business side. We all need a good CEO. Someone with business expertise to consider how they would grow our company. Take a few seminars, consult with your local Chamber of Commerce, and consult experienced veterans. The business world has its own norms and language. You need someone who can speak that language, or teach you how, especially if you plan to partner or collaborate with other businesses.
The legal side. Not be to be ignored. Keep things in order, and ask your attorney to help identify the areas that need attention first.
Your team. As you start attracting quality professionals that can help you, identify a way to tend to them and keep the vision and mission coherent in their minds