My advice is to browse as much as you can RCU and other fonts of information in the internet to see which models are the most popular around the world as trainer jets.. meanwhile a good starting point is a fast pattern ship. If you can fly it and land consistently and smoothly for a season, you are likely able to solo a turbine powered airplane. Another suggestion is to fly a jet in a r/c flight simulator with the auto zoom feature turned off , to get some idea of what you are getting into...

Best regards, Enrique