No work permit for him, that's why he would not get a contract or anything in writing. He will get the job and work but because not WP the money will be 25% of the actual while the local business gets 75% of his hard earned money.
Like everyone says this is a really BAD idea....maybe financially things are hard in T&T but there is still a shortage of labour. Your brother can get a small job but one that is honest and may be do some courses to get better qualifications. He must seek a long term goal to improve his life. But this chance he is about to take is one on his very life and worst yet freedom.
He should reconsider....there are better options...OP..