Your Answer Brief will be due within 20 days of the filing of the Initial Brief. And the Initial Brief is due within 70 days of the Notice. Your local legal aid office may be able to help you, but if you'd like to get an overview of the process, the Florida Rules of Appellate Procedure are available online. Good luck.
You can try legal aid in your county. Also the DCA websites are often helpful along with the Florida Rules of Appellate Procedure. Appeals are a lot of work and you're probably not going to find an attorney to handle one pro bono.
Please understand that the information given is not to be construed as legal advice. More information would be needed in order to make a more accurate legal determination on your matter. Furthermore, an attorney-client relationship does not begin until a retainer agreement has been signed by the attorney and client.
Contacting your local legal aid in your county would be your best bet. They can determine whether or not you are financially qualified for them to handle your case for free. You could also contact any Social Security Lawyer on this site under the contact an attorney section and inquire about whether they want to handle the claim. Good luck.
You have twenty days from the date the initial brief is served to serve your answer brief. However, the courts liberally grant extensions of time upon a proper motion requesting same. I strongly suggest contacting your county bar association or local legal aid society to seek pro bono (free) legal help. Appeals are very procedure-driven and have a lot of deadlines and technical requirements. A good command of the rules of appellate procedure is also important. having the assistance of an appellate attorney is very important.