Probably not as such type of matters do not usually have security interests.

Many cities or counties have legal aid or other organizations that provide pro bono (free) legal advice and services.

You need to locate the debtor to be able to serve the lawsuit.

Hire a new attorney. Consult with and hire another attorney before firing your current attorney.

Do a confirming letter with a request for a response. You may also file a complaint to the bar association.

If the person is practicing law without a license, then the agreement should be unenforceable.

It may be a scam. And it may be too Late to sue if it’s not a scam. Whenever one is unsure, give no information, demand proof in writing...

Yes. The judgment is recorded and applies to assets owned by the debtor. The debtor’s portion of the property is liened.

Look into filing a claim of exemption.

I would consult an attorney as this is also fraud.