First and foremost, join Toastmasters International as fast as you can. It's an absolutely amazing organization and will benefit anybody who wants to get ahead in business. Contrary to what many of you may think, it is not only an organization for people who want to become public speakers. Through the Toastmasters program, you will learn to think on your feet, to use a minimum number of words for a maximum impact, and to support your words and thoughts with corroborating facts. Your presentations to prospective clients will become tight and focused and you'll be able to respond to any questions with confidence.
Toastmasters also offers a phenomenally supportive environment.
Learn to set boundaries early on. Try not to allow yourself to be at the beck and call of your clients and perspective clients. Many of us are so set on delivering superior customer service and trying to be all things to all people that we lose sight of the fact that we are sacrificing our personal lives in order to please our customers. If anybody calls and wants to make an appointment for those hours, tell them you're unavailable due to another appointment. It will be absolutely true.