My husband to be came on DV lottery, I came on a visit but we intend to marry advice

You can marry while in the United States. After you marry, your husband could start the immigrant visa process. However, you will not be able to remain in the United States while the case is being processed. The filing of the petition on your behalf conveys no lawful nonimmigrant status to you. You will not be able to adjust your status to resident if you fail to maintain lawful nonimmigrant status until a visa is available for you. You can read more about family immigration at http://myattorneyusa.com/family-immigration.