Most retail investors should spend time investigating a forex dealer to find out whether it is regulated in the U.S. or the U.K. (dealers in the U.S. and U.K. have more oversight) or in a country with lax rules and oversight. It is also a good idea to find out what kind of account protections are available in case of a market crisis, or if a dealer becomes insolvent.
Never heard about Rob Booker. But if you interested in price action trading, Ichimoku trading & other PA based trading I would like to suggest Chris Capre for you. Because I completed few courses under him. Google 2ndskilesforex. Hopefully you can get to know more about him and there are loads of free articles, videos,analysis & other materials available there.