Pictures will tell the tale. If it is a mesh type or a spun aluminum, that's a good thing. If the dish surface is still in good shape, that's a plus. If it has an LNB, not LNA (post best detailed pics of the part in the center above the dish part) that's a good thing. If it has a cover over that center part, take care removing it. I've yet to remove a cover and not found wasp/hornet nests thriving inside.
IF the actuator arm and hardware are in usable condition that's a plus too. If the mounting pole is still plumb and still planted firmly in the ground that's also a plus. If it's a fiberglass dish it may not be properly equipped to be the best starting point to get into FTA.
EME work or transmitting of any sort is beyond what you've probably come across, and definitely beyond this forum. Visit the ARRL site for info on that hobby. You will need to become a licensed HAM radio operator to transmit virtually any signal anywhere.
If Free To Air TV and radio interests you, understand it is a hobby, and fills a hobbyists needs for TV. Can it be a useful source of TV programming...YES, but it is NOT an equal substitute for Dish Network or Direct TV type programming and plug and play use. Programming considered to be just one tier above basic cable are seldom available.
A good place to start is to invest in a Set Top Box (receiver) and a motorized Ku (band that uses the smaller type dish) setup. Lots of wiggle room here, scout around and ask questions. Although C band (requires larger dish) is older tech, most newcommers to this come from interest in Ku programming and later tackle the bit more complex aspects of setting up and maintaining a C band station. A few hundred dollars invested in a motorized turnkey Ku system is a wise choice, and the C band dish can be added to the mix with relative ease, presuming it is in usable condition.
Snap some pics and post them. We can tell you much more from there, but even if that one is not a worthy candidate, and you still want to check out the FTA hobby, by all means jump in. If you "get the bug" there are dishes out there that will work and can be had with a bit of searching. There are plenty of folks here that will do everything possible to encourage you and keep you on the right path.
Welcome to the forum.