If your country does not participate in the VWP, you must obtain a B-1 (business) or B-2 (tourist) visa before entering the US. Information on the B-1 and B-2 visas can be found at the U.S. State Department: (http://travel.state.gov/visa/temp/types/types_2664.html).

Please note that obtaining a B-1 or B-2 visa can be a lengthy process, so begin the process of obtaining a visa soon.