Written Contract in Florida

I personally guaranteed a piece of computer equipment (automatic dialer) while doing business in the state of Florida. The business was shut down and I moved to N.C. Now a debt collector from N.C. is going to serve me. It has been over 3 years since the last payment on the equipment. Is there a statue of limitations in N.C. and does this pertain to N.C. law, where I currently live, or Florida law where the contract was entered in? I have been sent a letter to pick up the summons at the courthouse or a sheriff will serve me at my home.It is a civil summons (should be under 10,000) but the letter from the collector states I owe 80,000.What are my rights? My ex filled BK so he is out of it and I didn't.
Thank you