Welcome to the forum. I've owned a Keltec since they came out, originally in .320acp and now in .380 acp. It's my everyday, no-matter-where-I-go carry pistol and I shoot the heck out of it.
More to the point the most critical thing you need to do now is become intimately familiar with that little pocket rocket so it performs for you properly should you need it. Shooting accurately and safely requires practice like any other sport. Shooting that particular pistol or any of the small, polymer based pistols like the Keltec requires even a bit more work. There's no mass to help with recoil so getting a firm grip on it and learning to get it quickly will be important. Gettting used to that long, gritty trigger also requires some getting used to. But, in a pinch, it will be a good hedge against an accidental discharge and will give you pause before you pull the trigger. In an emergency situation, you'll pull right through it without hesitatio.
Second, while it's always impressive to be able to shoot accurately at the back of the range, understand that we're talking about a 21' - 30' pistol here. I'd recommend that you practice with it at those distances and worry about longer shots later. The sights on these types of pistols are rudimentary and you're going to be shooting instinctively for the most part.
As for ammo, I usually just shoot .380 acp ball ammo. It's still tough to find. I've found Privi Partisan most commonly and it's a great ammo to become familiar with your new toy. Shooting up carry ammo that cost $.60 a pop will limit your practice however you should try it in your pistol at the end of your session just to make sure it works properly. I've found that the biggest problem with these types of pistol is that they "stovepipe" a lot probably the owners limpwrist them too much. IT won't take much, believe me. Also, some carry ammo tends to balk when feeding. It would be good to make sure that's not the case in your new Ruger.
Finally, look into the Crimson Trace laser attachment. Like the Keltec, it's molded to fit right over the trigger guard and is one of the slickist lasers you can imagine. I've got one on my Keltec just because it's a great intimidation tool. It may even stop someone from causing harm knowing that there is a laser pointed on their chest. I LOVE mine. But, it's not a true aiming tool because of the heavy trigger and short barrel.
Have fun with new pistol. It's amazingly innovative, super safe to carry because it is ALWAYS DAO so carry with one in the chamber.
Rome