Coolant overflow is above the right rear, it looks like that's where it was leaking. It's a classic sign of an air bubble in the coolant system, normally from topping off. Remove the oil and coolant caps and pry the plastic trim up with a flathead screwdriver, there's a purge valve, flip it open and drive it like that for a few days to let any air out.
The burning rubber smell can sometimes be bits of tire getting stuck on the exhaust, how soft are the tires you have on?