If you are so NEW at the hobby that you do not know what a cowl is - I think that a P51 could just possibly, mayby be BEYOND your level of expertice...

Perhaps you should consider saving the P51 for a day in the future - after you have mastered a Seinoretta, or an Eagle 2, a Kadet or even a Cub.

Currently; you are setting yourself up for a fall / disappointment / expensive learning curve. [&o]

IMHO