These cars can rust out badly on the underside if not cared for, especially in places where salt is used on the road during winter. Really look at every square inch under there to make sure there is no portion rusting out. If it is surface rust that can be cleaned up. Overall make sure that the underside, body, and interior are in good shape. Low miles would be just the cherry on top.
The plastic rocker arm covers on Eagles do leek oil, quite badly in some cases. An aluminum cover is what I have. You could also get an original metal cover, but those are hard to find and I think were only available for one year.
From how it looks in the pictures, the price seems to be worth it, but if it is too badly rusted underneath it would make it more or less a parts car. If the overall condition is not worth the price, try bringing the price down a bit.
As a fist car, as long as you know how to properly take care of it and maintain it; These make great first cars. My 1986 AMC Eagle Limited Wagon is my first car (also first antique car). After a good amount of mechanical work has been done by us, it has been getting me to and from community college with no problem.