Welcome
Always, always, safety first. A round fired can
never be taken back.
Never assume yours or any weapon is unloaded - always verify by sight and feeling the empty chamber with magazine removed. If someone hands you an "unloaded" weapon, decline to take it directly from them. Let them remove any magazine, lock back the slide, lay it on the bench facing in a safe direction.
Muzzle discipline - always pay attention to where your muzzle is pointing. It is a long-range drill, do not allow it to make holes where it shouldn't. If you need to turn from facing a target, keep the muzzle pointed down range (safe direction) as if a magnet is pulling it. Never allow the muzzle to follow as you turn to talk with someone or do something. Never let it point at any body part, yours or anyone else's. Never forget what you have in your hand.
Trigger discipline - keep your fingers (and everything else) off the trigger and outside of the trigger guard until you are on-target and certain you are ready to fire.
Holster - Protects the trigger from accidents, it is a necessary safety device that also secures your weapon on or about your person. Get decent Kydex or leather from respected makers, even if you have not yet learned to carry.
Get to know your new weapon thoroughly. Read the manual, field strip it, understand how it works, keep it clean and properly lubricated.
There are many members here who generously share far, far more knowledge than you or I will ever know. Learn from them and from direct training if you can.
After all that, have fun, and post a pic of your new pistol