You will love the inherent precision and great versatility of even a basic AR. Some of my least expensive guns were gifts from a relative or inheritances. I now have too many long guns to all fit in my 32 slot safe at soon to be 65 years of age. Those basic guns form the heart of my collection. My first pre teen single shot 22. My first single shot 12 gage. The .30-30 my dad gave me that I shot my first deer with (since stolen from my car), the first rifle I bought with my own money. The rifle I inherited from another relative that took my largest deer. Another shotgun (semiauto) that just "fits" me and reminds me of all the bird shooting he and I did together. Most of the others are higher grade arms that I have picked up over the years.
The ones given me all tell a story and are now heirlooms, regardless of current modest value in most cases. My free advice: Honor you're uncle for thinking enough of you to buy it. If he is local, go shooting with him. Look at his face, see the smile. I don't care how rich he is, he gave you this for some reason besides its cost. One day be will not be here. Build some memories with it. It is not every day someone thinks enough of a family member to bestow on them something that may have cost him far more than its current value.
Put an inexpensive folding rear sight on it, like a simple Magpul MBUS ($50-60), buy some bulk 55 or 62 grain ammo and go shoot the rifle. You may get hooked.
If you want to put an optic on it Walmart or any sporting goods store will have the basic "high rise" version of the little Bushnell TRS-25 micro red dot. This has a riser in the box to lift it up to match the height of your stock and to put the dot up over the top of your front sight. It is plentiful, durable and dependable enough for practice and range use and under $100.
Remember how much your uncle must have thought of you. He is a rare person in today's America. When the time comes that you can do something like this for your own child or a close relative, do it to honor them as he has done you, and to keep the Second Amendment alive and vibrant.
Forgive my soapbox moment. but stuff like this needs to be said from time to time, even if the hear of this post is not technical.