change the oil immediately
fram or bosch oil filters are fine, dont get ac delco
run 10w30 or 10w40, non-synthetic

if the car has been sitting for a while your rotors are probably shot, definitely gonna want to fix the brakes. new rotors/calipers/pads...can run from:
reman calipers for front (rockauto.com) - $50x2
cheapest rotors (autostar/USA ind.) - $25x2
^the calipers come loaded with pads also

so you could probably replace ALL the major components in your front brakes for about $150 if you do the labor. chiltons/haynes manual is about $15.

as far as the 4ws light, let me dig up my helms and ill post the diagnostic procedure for it.

~kris