Hi there,
Very nice bike.
It can be good to leave a rare bike like a TRM as a 'survivor', so before you get it rechromed you should check whether it's really required.
Have you tried polishing up the frame with Autosol. You might find any surface rust is easily removed with a little fine-grade wirewool.
Certainly change the tires.
Hang onto those bars for now, others will chime in here but they look similar to SE Powerwings or GT Pro bars. Check first before you think of getting rid of them!
Very nice mix of old parts, lots of character!