#1 No there shouldn't be a fee
#2 Yes and Yes. Your taxable Social Security might change.
#3 You will have to mail prior year returns. Include a check.
#4. Probably not needed since you have to mail it.
#5. You can only amend for a refund fee 3 years. No time limit if you have a tax due.
How to Amend a prior year
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
