[whtteg]

Welcome to the boards!
The maint. required light is normal, all you have to do is reach under the dash on the right side of the steering wheel and you will feel a box. There will be a button on the end of the box, press that in and hold it for a few seconds until the light goes out. Note do not drive the car before doing this, if you do it will not reset, just turn the ignition on and the press the button.
Yes you should replace the front and rear camshaft seals there are two front seals and one rear seal. And yes you should replace the front crankshaft seal as well. IMO for the little price difference I would go with the OEM seals. ANd yes it would be a good idea to get the coolant flushed and refilled, also if the tranny fluid has not been changed in the past 30K miles change that as well.