Two of the best local resources for assistance are the SIUE Small Business Development Center and the O'Fallon/Shiloh Chamber of Commerce. Each can help direct you to the resources you need to get started and grow your business.
The Illinois Entrepreneurship Network, a statewide umbrella organization of small business resources coordinated by the Illinois Department of Commerce and Economic Opportunity:
Procurement Technical Assistance Centers (PTAC) - Sell to the Government
Small Business Development Center (SBDC) - Business advice and training
International Trade Center (ITC) - guidance on exporting