L2 EAD application questions

Currently i am holding L2 visa, i have below questions when applying EAD.

  1. Can i apply EAD once I arrive in US or need a few days to get the I94 ready?

  2. Do I need to get SSN before applying EAD since the question 9 need to be filled with SSN in the application form?If no SSN, should I enter “None” or “N/A”?

http://www.uscis.gov/sites/default/files/files/form/i-765.pdf

  1. In the i-765 form, question 11 and 17 are not valid for me, do I need to fill with “N/A” instead of leaving it blank?
  2. For question 16 of the category, do I need to fill with (a)(18)(none) or leave the third one as blank like (a)(18)()?

Thanks in advance!