Hi there
Do you have a two wheeler licence from your country of origin? If you do, things are sooo much easier - you can get it converted to Nepali. You just need documents like photocopy of your passport, visa and licence, letter from your embassy and the form from the Licence place in Ekantakuna.
If not, you will have to fill up a form, get it approved, they will give you a date for written test, if you pass the written you get a date for practical test.
Hope this helps.