I married a nigerian with visitor visa what is my next step so he can obtain employment

You and your husband will need to file a marriage-based adjustment of status package with USCIS. This requires you to file an immigrant visa petition on behalf of your husband. Your husband will file an application for adjustment of status. He can request an employment authorization card. You can read more about the process at http://myattorneyusa.com/family-immigration. Some attorneys, including our office, allow for payment arrangements for our fees.