the high idle is most likely the car warming itself up.

the maint required light is programed to come on at certain intervals according to the mileage. first itll start off as a couple blinks, then advance to more, then eventually i think it will just sit there for a few seconds.

but anyway, it was programed so that you will be reminded to change your oil. you can turn it off fairly easily. there is a button under the dash. it is a square button can be found on the edge of the panel that goes under the steering wheel.

what you want to do is have the car turned off. hold the button down. turn on the engine. the light should now have a long blink, then turn off. then release the button.