what should I prepare and how much I pay? how long time available for L visa, and when to apply?

Jack, you should prepare a passport valid for at least six months and having more than two blank pages, a copy of the passport, a completely filled application form attached with your recent half-length photo, the original and photocopy of your work certificate in Jordan, and round way tickets and hotel reservations. It normally only takes four business days to get the L type and you are suggested to apply one month prior to your planned trip. As for the fee, I have no idea about it. You can consult this with the embassy.