1. Identify your NAICS codes
The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy. Visit this website and search for the NAICS codes that are applicable to your business’s products and services.
http://www.census.gov/eos/www/naics/

 2. Identify your SIC Codes
SIC codes are used by some government agencies to classify products and services. Visit this website and search for the SIC codes that are applicable to your business’s products and services.
http://www.osha.gov/pls/imis/sicsearch.html

 3. Identify your PSC/FSC Codes
PSC and FSC codes are numerical codes designed by the government to create descriptions for products and services. A-Z are for services and 10-99 are for products. Visit this website and search for the PSC and FSC codes that are applicable to your products and services.
http://www.outreachsystems.com/resources/tables/pscs/

 4. DUNS Number
In order to do business with the federal government you must obtain a DUNS number. If you do not already have a DUNS number, then please call Federal Government Contractors dedicated D&B phone line at 1-866-705-5711 or visit this website to request a DUNS number.
https://iupdate.dnb.com/iUpdate/viewiUpdateHome.htm

 5. Complete your SAM Registration
In order to do business with the Federal government you must first register on the System for Award Management (SAM). This registration provides government agencies with a profile of your company, your firm’s representations and certifications. Upon completion of this registration you are also provided a link to register on the SBA’s Supplemental Pages/Dynamic Small Business Search database. Only small businesses are allowed to register in the Small Business Dynamic Search database. Registration in the Dynamic Small Business Search database can only be accessed when you are logged into your SAM account.
https://www.sam.gov/portal/public/SAM/

 6. Register and Get Certified with the State of California's eProcurement System
eProcurement is the State of California's vendor registration, solicitation, and certification portal. If you are interested in obtaining a certification or becoming a vendor, with the State of California, complete this registration. Registration with BidSync is free. After completing your registration, you will be notified via email when your registration is activated, then you can log in to eProcurement and complete the online Small Business certification application located within the eProcurement system.
http://www.dgs.ca.gov/pd/Programs/eprocure.aspx

 7. Braddock's Procurement Opportunities Guide
Designed to help small business owners and decision makers understand the government procurement and private sector procurement spaces. The Guide provides an overview of government and corporate markets with an emphasis on who buys and how buying decisions are made. The Guide also presents "next step" resources for federal and state governments and the private sector.
http://goo.gl/a8jTd