bring your nepali driving licence and a letter from yatayat byabastha bivag stating that u have no traffic voilation  till today,when u r here go to maryland mva and apply for maryland driving licence,it is only in Maryland where u can get a driving licence without ssn or anyother documents but u need to have 2 proofs that u r resident of Maryland,u can open a bank A/C in MD and have a cellphone line registered in MD,u should have the letters sent to u by bank and the cellphone network provider.for further information go to the website maryland mva.com.

best of luck