The IRS has forms and publications for businesses and the self-employed.
https://www.irs.gov/businesses
Starting a Business
https://www.irs.gov/businesses/small-businesses-self-employed/starting-a-business
Self-Employed
https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center
IRS Tax Calendar for Businesses and Self-Employed
Small Business Taxes: The Virtual Workshop (video)
State Business Registration
https://www.ncdor.gov/taxes-forms/business-registration
Sales and Use Tax
https://www.ncdor.gov/taxes-forms/sales-and-use-tax
Corporate Income and Franchise Tax
https://www.ncdor.gov/taxes-forms/corporate-income-and-franchise-tax
Withholding Tax
https://www.ncdor.gov/taxes-forms/withholding-tax
NCDOR Tax Calendar
NC Business Tax Seminars and Workshops
Mecklenburg County Business Personal Property Tax
Mecklenburg County Office of Tax Collection