US Small Business Administration: Step-by-step for how to begin your business

Wisconsin Small Business Development Center: Local resources to assist you

Minnesota Small Business Development Center: Local resources to assist you

AllBusiness.com: Comprehensive resource addressing all your questions for starting and maintaining a business, including blogs/chatrooms

Entrepreneur.com: Find business opportunities

FranchiseGator.com: Connecting entrepreneurs with franchise business opportunities
Also see FranchiseDirect

Yahoo! Small Business: Tools for assisting you with making a web presence, email, marketing, etc...

IRS.gov Small Business: Courtesey of the US Government, tax and finance resources for starting your own small business