[44net] ASN # and Network Service Provider (NSP)

Hi Guys,  I am trying to locate two pieces  of information to be able to complete my BGP request. This seems to be more of a challenge then I though it would be. Is there a reference page or wiki that I can provide to my ISP to be able to locate this information. We have been dealing with these two questions for over 2 weeks. I am not sure if the ISP or the NSP know exactly what we are looking. From what I understand the ASN is just a number. No letters involved in this number. Is this true??? Any help in providing information to the NSP would help. Break Down - I will be connecting to ISP via VPN connection.                          The ISP connects to his feed in Houston via I ATT fiber connect to his NSP in Houston.                           The ISP sell service to clients in his area. He has a /6 himself. Please don't laugh. I am trying to lay this out the best I can. Any help would be appreciated. 73 de Angelo / N5UXT