The following list of resources provide a wealth of information on government contracting
DCAA If you want to go to the source for DCAA Audit Requirements, this is it.
GSA The source for tracking government per diem rates, mileage reimbursement rates, and other items related to doing business with the Federal Government.
FedBizOpps Just about every government procurement opportunity will be be posted here.
The Small Business Administration If you are looking for a small business loan or grant, this is the place to start. Check out the Office of Government Contracting within the SBA.