I can't believe your lawyer gave you this advice. I wouldn't pay this lawyer anymore and do any further correspondence on your own (just MO).
If you paid $1010 for your AOS, you do not owe any fees for AP or EAD.
According to instructions:
QUOTE
If you filed a Form I-485, Application to Register Permanent Residence or Adjust Status, on July 30, 2007, or after, then no fee is required to file a request for employment authorization on Form I-765. You may file the I-765 concurrently with your I-485, or you may submit the I-765 at a later date. If you file Form I-765 separately, you must also submit a copy of your Form I-797C, Notice of Action, receipt as evidence of the filing of an I-485.
QUOTE
If you filed a Form I-485, Application to Register Permanent Residence or Adjust Status, as of July 30, 2007, no fee is required to also file a request for advance parole on Form I-131. You may file the I-131 concurrently with your I-485, or you may submit the I-131 at a later date. If
you file Form I-131 separately, you must also submit a copy of your Form I-797C, Notice of Action, receipt as evidence of the filing of an I-485 as of July 30, 2007.
You can file both of these applications electronically or use the forms here:
APEADLike Crikey said, you can write "To Be Determined" under date.