98 Subaru Legacy wagon- faint smoke & burning smell

I purchased a 1998 Subaru Legacy L wagon
a few days ago. Test drove on the highway
and on city streets, drove well and everything
looked good so I bought it. Dude told me the
car had a small oil leak. It drives perfectly fine
and there are no lights on, temp gauge looks
good during driving. I’m noticing now the car
kinda smells like burning (oil?) after driving it
and a very small amount of smoke is coming
from the passenger side under the hood. My
dad said he thinks the oil may be leaking on
the manifold and the smoke I’m seeing is
from the oil burning. Does anyone have
experience with this issue, know what the
problem might be? Is it gonna be expensive
to fix? I’m a 21 yo college student across the
country from my pops so any tips greatly
appreciated! TIA :-)