I have researched this, and there are no formalized books or ground school classes issued by the CAA of Trinidad and Tobago. Call the CAA head office, and they will tell you the subjects you need to study for. You have to sit 9 exams including UK Performance A and T&T Air law, take a T&T CAA medical and pay the exam fees. Your looking at about £300 to do the exams, plus money for the medical. I estimate it would cost £500 in total to convert. No flying test involved. this was based on the last information they gave me in August.
Also, Google the Trinidad and Tobago CAA and go to their website. All the information is there.
If your hoping to get a job with CAL or Briko, thats a very different challenge. Get to know someone!