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A green leak is usually a coolant leak, remove the radiator cap and check the coolant level. A cooling system pressure tester will need to be used to find the leak. Most auto shops will check for a leak for a low cost.
A green oil leak could be oil from the A/C system.
There is green oil dye in the A/C system. A/C oil is dyed green, this is used to find leaks in the system.
You should be ok to drive, just make sure to top off the cooling system. Look in your owners manual and you should find the procedure to check the level. You can still drive if there is a leak in the a/c system.
There is not a low coolant level sensor. Check the level when the engine is cold. and just fill to the top of the radiator cap. If you don't have any coolant just top the system off with water. Driving the vehicle with a coolant leak can cause internal damage.
What side of the engine is the leak on?
How big of a puddle does it leave?