I agree with the others..there are so many areas to go from here..
Creating your business plan
Determing w/IRS are you going to be a sole proprietor, LLC, Corp,
Reseraching Tax info for small businesses
Marketing, Marketing, Marketing Your business
Creating RFP's, contracts for services
Bank accounts for the business
Preparing yourself for the first client, the questions they will ask..so much
The list can go on. The idea about the master list area will be very helpful for you on this site. I found it helpful for me as well!
I wish you much success as you grow and cultivate your business!

~Capricia