Welcome. Please take advantage of the free download of tech and owner's manuals, called the RAVE, link below.
You will find lots of things to do in our technical section. One is a list of high miles things that will need to be done.
For seats, you can find those in u-pull-da-partz salvage yards for $25 or so. You won't find a good driver's seat. I used two passengers. See
Disco 1 driver seat swap
Most "runners" are about double what you paid, so quite a deal, if no overheating (above 9:00 on temp gauge).