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Download the I-864 from USCIS website and complete it. Then mail it with the support documents to NVC. Read these links:
http://www.immihelp.com/affidavit-of-support/submitting-affidavit-of-support-nvc-uscis-processing.html
http://www.usavisanow.com/spouse-visa-cr1-ir1/immediate-relative-petition-ir-1-cr-1-nvc-processing/
http://www.immihelp.com/affidavit-of-support/submitting-affidavit-of-support-nvc-uscis-processing.html
http://www.usavisanow.com/spouse-visa-cr1-ir1/immediate-relative-petition-ir-1-cr-1-nvc-processing/