a clicking noise you may be hearing is probably normal injector noise, kinda hard to diagnose on the net,
the oil leak is either the factory oil lines or the rear main seal, nothing to be going nutts over, have the rear main checked, and check the oil cooler lines, they are in the front of the engine on the passenger side, going to an aluminum lookin cooler on the fenderwell,
the rear main is where the tranny meets the engine, you cant really see the rear main but if its leaking where they meet its probably the rear main seal, tranny muust be removed t fix the rear main leak