Also, just to say, hello and welcome to our weird little community!
The p-40 is an iconic plane, but I would offer the caviat that, as represented in this sim, it is challenging. The engine management is some of the most unforgiving in the sim. The climb rate is sedate, and you will find yourself often losing energy faster than opponents. However, with discipline, you'll learn to love the dive rate, and the 6x.50s are very powerful, and you have ammo to spare to walk your shots into the enemy / set up a wall of lead for them to fly into. Leave the canopy open and you both look stylish and have a great field of view.
Personally, and with a degree of national and personal bias though, I would perhaps point you in a different direction.
Have you considered the Spitfire V? The spit is generally available in both East and West front scenarios, even later in the war, and though she may lack a bit in speed, she's more than capable of outmanouvering anything the opposition can throw at her. 2x20mm and 4x.303 are pretty powerful, though you only have 6 seconds of 'squirt' for the cannons. So it'll teach you trigger discipline and the importance of setting a correct convergence for your guns. With the two engine options you can optimise for either high or low altitude business too. @ShamrockOneFiveis too modest to do it himself, but I'll point you in the direction of his excellent blog, https://stormbirds.blog/, particularly the 'aircraft gazetter' section where he discusses strengths and weaknesses of most all of the aircraft currently in game https://stormbirds.blog/aircraft-gazetteer/
Have a peruse, its actually like a nice little showroom to browse before you part with your hard earned cash monies!
See you in the sky!