Small Claims

I work at a heat and air distributor. A contractor (the customer) has purchased several thousand dollars worth of heat and air equipment, and refused to pay for it. The business is located in one county, while the contractor resides and does business in another county. Most of the transactions were conducted over the phone. What county do I file the small claims suit in?

My car was parked and severely hit by an uninsured motorist. I want to sue her , what do I need?

What forms do I need to file small claims for repayment of money loaned?

I found a used car I wanted to buy on the internet. I met the seller at his house with 2 of my friends. I bargained from $5200 to $4500. We shook hands 3 separate times and closed the deal. This was done in front of my friends and the seller's wife. He even told me that he would not sell it to anyone (in front of my friends). However, he sold the car to someone else, apparently that same day. Do I have a case to sue him in small claims court for breach of an oral contract? I have an email admission from him that he went back on his word.

Would it be worth it to take someone to court for $120.00? (Small claims count)