When you first start the Car it is normal for the lights to all show on the dash. ABS is you anti lock brakes, Most of these systems are coming alive when you start the car. It's the ones that stay on or flash that are the headache. So sometimes what happens is when you get Fuel and the Gas Cap doesn't get tight enough this will cause that to happen. However that may not be the case. So if you have an Auto Zone in your area or other
auto parts stores they will sometimes hook the Car up to a scanner and it will tell you what the issue is. A lot of times it's some sensor that is dealing with the exhaust flow.
Hope that helps. You can also do a google search for the issue and select videos or youtube and there are plenty of vids that deal with that on there.
Welcome to the Monte Carlo Forum and hopefully you will be able to solve it without to much headache.
You should see what the service record of the Car is and Check the Fluid levels or have them checked. Transmission fluid make sure it is not Brown, if it is have it changed by a reputable service. Not sure where you are but you can call a Garage and ask for a price to get service completed. Walmart for instance does a lot of service work. The technicians are fairly smart. Keep us posted as to what is happening. Good luck.