Scott, It depends on what kind of expediting you want to get into as to how you can get started.
The term "hotshot" is not quite the same as expedited. Expediting "usually" refers to a cargo van, straight truck, or 18 wheeler that picks up some type of freight as little as a few pounds and goes from point A to point B without picking up anything else and with as much speed as possible, "USUALLY", whereas "hotshots" are usually pick-ups, or six wheelers with the capability to tow flatbed or gooseneck trailers.
Just as Lawrence said we need to know more about your needs and if you want to run short trips or 48 states and Canada. Also how long you will stay out and if you plan on being an owner-operator or drive for someone else.
You might check out the ads such as Thompson Emergency, Fed-Ex Custom Critical, etc.
My preference is Tri-State Expedited Services and they have a good webpage you could check out as I am sure most of the others also have. Last but not least,ASK LOTS OF QUESTIONS. Good luck, Thumper