You should post your questions to the immigration section of AVVO. There are many good immigration attorneys here on AVVO, and my colleague here in Washington DC handles such work as well.
The foregoing is not legal advice nor is it in any manner whatsoever meant to create or impute an attorney/client relationship.
I cannot help you with the immigration issue of getting a foreign employee a visa to enter and work in the US, but I can help form a US business entity, assuming you are not from a country that is banned from engaging in business in the US, or the transfer of funds or equipment to a specific foreign country.
The foregoing is not intended to be legal advice upon which you may rely as I have not been retained for this purpose.