Too much oil caused an oil leak?

Got my oil changed bythis ass with a
wrench and he added too much oil.
When I accelerated rapidly I started
hearing a ticking coming from the
engine and the oil pressure light came
on, I stopped and shut off the vehicle.
After looking underneath of it I found
an oil leak coming from what I think is
the valve pan and another place
where there must be a gasket, this
place is right behind the lowest pulley
for the timing belt. What is this gasket
and is it an expensive fix?