Hi!

About the flight characteristics:

Any jet that flies can be your first jet with success. Why? You must be experienced prop pilot before you get to the jets. When you are able to fly warbirds, F3A style planes, pylon stuff etc... with comfort you have no problems with any jet.

If you want more traditional flying characteristics like F3A aerobatic plane, get a plane with more traditional layout, large wing, large tail etc... An MB339 from any manufacturer is a good example of that. If you want more speed with traditional flying characteristics get a Hawk or a Bandit or something like that. If you want some High Alpa-capability get a Rookie or similar delta wing plane. Either scale or not, it is up to you. Modern american fighters F-15, F-16, F-18 etc have flight characteristics somewhere in between.

One thing is for sure. Size does matter! The bigger the plane is the easier it is to fly.

About the building and structure...You should make sure that everything works and the structure is strong enough to prevent the flutter. Better safe than sorry. No matter which plane you decide to get, you need to be a hundred and ten percent sure it works and doesn't flutter.