What maintenance & checks are needed for 2007 Corolla S with 124K miles?


My Corolla S has 124K and there were only a few things done up to now except oil changes.
Front brake pads are replaced at 80K, Spark Plugs just recently. Not even transmission flush / change yet. Transmission fluid is light brownish and has a light smell.
There is a small noise heard only when the front wheels goes over the speed bump. It came like from the loose joints or something. What could be the problem?
Engine is a little noisy when speed is at 65 to 75 Mile/hr.
What overall maintenance & checks should I do?
Also, Engine idle reduced to 0.7 rpm from 1 rpm. Is there any way to fix this?