Answers Kanchha-Dai gave to your questions are perfect. Just follow his suggestions. You don't need to show any financial document in Nepal if you have enough RA/TA stipend to support you and your wife. If your wife is applying for F2 visa, NO you don't need to show her academic transcripts and work experience. With her visa status (F2) she is not entitled to work or study in US legally so there is no point furnishing documents that show her work experience or academic background. I hope that helps. Good luck!