Lol - I’m in my 40s and married! I AM thinking of a .45 as a first pistol. If that is a mistake - how come? My only experiences shooting are a gun range in Vegas and air guns in my basement. I appreciate all advice from those who know more than I (at the moment, that’s probably everyone!).
SKS is good, but make sure your gun club (if its where you intent to shoot) allows steel-core ammo if you plan on shooting some of that stuff...then you will need to properly clean the rifle to prevent pitting caused by corrosive ammo if not cleaned after the shooting session...
For pistols:
Cost of ammo vs 9mm. I got a 9mm and my next pistol will be a .22LR...cheaper to shoot, can bring a brick to the range per day if you want...When I bring my 9mm, I shoot about 100-150rds...maybe im cheap....