RE: New Modeller
well I would
1 find a local club
2 get some simulator time
3 get some high wing trainer time
4 maybe then move into that p51/trainer
5 then if you are still having fun, you have a knack for flying,,,,and don't mind the work and money risk... start looking at a bigger nice flying warbird.
It all really depends person to person, but the first few steps are probably going to determine if you stay in the hobby or not. There are some nice arfs available now, but I imagine you may end up being a builder from the sound of it..Thats as much fun as flying to many people. That way you have hundreds of hours of bench flying in before hitting the field.
The main things are fun and safety...