Can the case questionnaire (disc010) for limited cases be filled out and verified by an attorney?

The form can be filled out by an attorney based on information you provide to him or her, but only a party can sign the verification.

Re: First Amended Complaint

Not if they have already been served on the defendants.

A Motion to Compel is not a responsive pleading. Even if you file a Motion to Compel, you will still need to file an answer, demurrer and/or...