It’s getting very hard to find practice ammo to use with some of my firearms. All the common calibers are in short supply. While I have reasonable quantities of 20 ga., .38 Special, .45 ACP, and 7.62 x 51 mm rounds on hand, I’ve deleted my stocks to the point that I’m now using other calibers for practice, .243 Win, .30 Carbine, .and .45 Colt, but mostly .22 LR. If the .22 stash runs low, I have a couple of bricks of .22 Short ammo and an old High Standard target pistol chambered for it. I may be using my 16 ga. for hunting the fall.
Which brings me to the point of this post: If you’re buying a firearm, also buy several hundred rounds of practice ammunition at the same time, and use that ammo to familiarize yourself with the new gun and verify that it functions properly. (And cleaning the gun after using it will help you understand how it works, so buy a cleaning kit too.) If you can’t buy enough ammunition for that introductory practice, you probably should buy a different gun.
If it’s your first gun or if it’s been a long time since you handled firearms, get training in safe gun handling. I recommend the NRA’s Home Firearm Safety Course or you state’s Hunter Safety Course. The online version of these courses will give you good information, but proper hands-on instruction will give you a better opportunity to practice safe handling skills.
Finally, make sure you have what is necessary (slings, holsters, storage boxes, or lockers) to safely carry and store your firearm.