If you are not bike savvy, then its not worth restoring. Paying someone else to do the work will run up the cost, a lot.

Note, bike does not need to be restored. It does need full maintenance: tires, cables, housings, bearings, grease. Even then if you pay for that work, you will be upside down on the bike.

Better to wash it off, air up the tires, and sell it.

As far as the year, google bicycle component codes and look up the codes on the crank arms and derailleurs.

Nutted axles, stamped drop outs, stem shifters, etc = very basic bike, really depends where you live. As is, around here, $50. Fully refurbished, $100. No way $50 more covers the work required along with the consumables: bar tape, tires, cables, housings.