Problem with my 07 jetta

My jetta I bought the other day and was driving it
home when it made some kind of noise under the
hood. The mass air flow was unplugged because it
wouldn't run with it plugged in at all. I pull over kill it
and get out of the car. A few mins later I get back
into the car to move it to the shade and after
starting the motor white smoke goes out from
under the hood so much you could hardly see
threw it. After letting it set a while I drove it back
home and it did the same thing at home. I kill it and
start back and the smoke rolls. The muffler is
broke someplace up close to the motor and this
time I see a plug of some kind open on the end of
my motor and a small amount of oil had came out.
It never got hot and ran good the whole time. I
never had this happen before any help will be great
I'm stuck on this one?