CCH Business Owner's Toolkit   Especially see "Setting Up Your Books" under "Getting started" topics. Almost too much information to read online. Recommended.
Inreach has two online small business books for you. One on "How To Start A Business." The other written for people currently running a business. Recommended.
SBA business start up kit online The Small Business Administration Start Up Kit Online. A complete online guide which will help you understand and get started in small business. Information on SBA loan programs and regulations affecting small business. Recommended.