visit visa B2

[chigoo]

Hello immihelp,
i'm igbokwe, from Nigeria, am a medical laboratory scientists, working in a govenment hospital here in Nigeria, with good salary. my cousin is living in USA, he is a citizen there. i want to visit him for a 28 days holiday, by October. please, when should i start to process for my B2 visa, and do i need to buy flight ticket first, before attending interview. what do i need to know, to help me, succeed. Thanks

[immihelp]

1. You can start the process a couple of months in advance.
2. No, you don't need a flight ticket first.