I recommend checking out the SBA, Entrepreneur, The Start Up Journal & Nolo. All 4 are great informational resources for the new/small business owner. I posted links for you in the source box.

Associations may be a good avenue to explore as well. These organizations will address many of the thoughts, questions and concerns you’ll inevitably have as well as many you haven’t anticipated yet. See the source box for some relevant links.

Research, research, research – this cannot be stressed enough. Read as much as you can about the industry. Here are some book titles that are relevant:

* Start Your Own Interior Design Business and Keep It Growing!: Your Guide to Business Success : Touch of Design by Linda M. Ramsay
* FabJob Guide to Become an Interior Decorator (FabJob Guides) by Tag Goulet, Catherine Goulet
* The Interior Design Business Handbook: A Complete Guide to Profitability by Mary V. Knackstedt

There are plenty of free informational resources out there. Check the source box for links to articles.

Hope that helps! I wish you much success & happiness in all your ventures!
References :
http://www.sba.gov
http://www.entrepreneur.com
http://www.startupjournal.com
http://www.nolo.com/resource.cfm/catID/9FA25870-14F1-4657-9778F19FB41FB93D/111/228/ — Nolo’s Starting a Business – Resource Center

Associations:
http://interiordec.about.com/od/profassociations/ — Listing of Associations
http://www.cidinternational.org/ — Certified Interior Decorators International

Articles:
http://ezinearticles.com/?Interior-Decorating-For-Fun-and-Profit!&id=50330 – Interior Decorating for Fun and Profit! by Randy Wilson
http://ezinearticles.com/?Starting-Your-Own-Redecorating-Business:-The-First-Key-Steps&id=43374 – Starting Your Own Redecorating Business: The First Key Steps by Julie Dana
http://ezinearticles.com/?A-Misunderstood-Profession:-Interior-Design&id=213224 – A Misunderstood Profession: Interior Design by Karen S. Weiner