My condolances regarding your friend and his father. Under the circumstances, the rest may seem harsh, but I think it needs to be said.
Now, about you and the M-1:
There's not enough information to insure that some of my points aren't off base, so don't get offended if some don't seem to fit your case.
1) re-read munk's post several times.
2) take the advice about getting the school classes you need, and graduate.
Now, let's look one of your previous posts about the M-1--
"What's cool about the whole thing is that this gun was the first gun I ever touched, now it's the first gun that I've ever owned, and will soon be the first gun I ever fire."
Sorry, but this doesn't really look good, considering the current circumstances.
And you need some advice on just what the situation is in your state since it sounds like you are likely a minor. If you're not a minor, then some of this doesn't apply. Some things to sort out:
Even if it did not appear that the rifle was "technically stolen", was it legal for your friend (or possibly anyone else) to transfer it to you? Many states stipulate that only parents or legal guardians may transfer ownership of a firearm to people below a certain age. If your friend is a minor, could he have legally sold it to anyone?
What arrangements had you made to learn to safely operate the firearm? Was a suitable location found? Who would instruct you? If your family, relatives, or immediate circle of (hopefully adult) friends knowledgably handle and care for firearms, then this is likely not a big deal. The fact that you said you'd never fired a gun a few days ago, that this rifle was first firearm that you'd ever touched, suggests that you don't live in such an environment.
So, if indeed, you had not made arangements for proper instruction, and hadn't access to a suitable place to practice, then I would have to ask, "What were you thinking when you took possession of the thing?" If the "plan" to introduce you to firearms was for you and your (now very sadly discredited) friend to go out somewhere and mess around with the rifle without instruction or supervision, then you're kinda stuck now. Sorry to be blunt, but that's the way it is, and you need to face up to it so you can get out this mess.
Yes, plenty of 12 year olds can safely and effectively hunt or shoot target--that's because they grew up with firearms in the family, and that family began to teach the safe use of firearms to the kid BEFORE he shot one, let alone owned one. (Like helping to clean the gun, and getting whupped if it was ever pointed in an unsafe direction, or not checked AGAIN to see that it's not loaded. Learn that, then the first shots are permitted.) Some things must become automatic habits before a firearm can be safely handled. That's true for anyone, now matter how old they are. Sadly, often forgotten now, it seems.
Start with an NRA-affiliated .22 rifle marksmanship program, and you'll get a fundamental foundation for whatever shooting hobby you pursue later. At an inexpensive price. They usually provide the rifles, sell ammo to be used on-site, and have everything else needed as part of the package. The progression from prone position, through sitting, kneeling, and standing, should be enough to keep you busy for a few years.[It's darn rare for any youth to achieve top marks in all positions before they are too old to earn the "Distinguished Expert" award--I only got about halfway through kneeling.] A single-shot .22 rifle may not seem glamorous, but it is what most folks taught the old-fashioned way started out on. You can get a good start at a club with air-rifles too. You might get to hang out with folks who are state champions or Olympic hopefuls too.
Learing proper range-safety, strictly enforced, will benefit any firearms owner for the rest of his life, IMO. I think it is essential. The NRA used to have a decent hunter-safety course that lasted several weeks culminating in small-caliber target shooting as well. [The hunter-safety "courses" where some guy yakked for eight hours and you took a written test don't cut it.]
And if you participate in some certified matches, you'll qualify to buy an M-1 or similar yourself through the civilian marksmanship program. Or you might decide to stay with small caiber target, or take up skeet, or...
You started out the wrong way, there's plenty of time to step back and learn right, find a good program, and you won't even need to purchase a firearm until it works out for you. If you're a minor, you will need your parent or guardian's involvement to get started though. Hope everything works out without too much hassle, and again sorry about your friend and his dad.