A Glock 19 is an excellent first gun. A Sig Sauer P320 RXP Compact would be a very similar model to look at, I’d also recomend the Beretta 92X Compact. I’m assuming you’re in the market for a compact, but if not Glock 17 would be one to look at, or full size versions of any of the guns I’ve mentioned. Personally I’d advise towards the Berettas. They are excellent guns and have many built-in safety features that the Glocks and other striker fire pistols lack. But you really can’t go wrong with a Glock, Beretta, or Sig Sauer, they are all great brands.