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1st thing is to tackle is the fluid leak, as if its engine oil then you cannot run the engine until its fixed otherwise you risk blowing the engine
I'd say to remove the passenger wheel and take a good look around to see what is leaking / damaged
and its quite possible the leak is transmission fluid as there is a seal inside the the shaft that has failed and it can fail so allowing oil to travel down the shaft and leak out of the outer CV boot.
you need to act quickly as if its left you can also need to replace the clutchs inside the gearbox and also the driveshaft joint as the ATF will have washed out any grease