Leaky Gasket? What am I looking at?

I bought a 1997 Subaru Legacy L Wagon. It has a
salvage title. Since then I had an issue where the
car went from starting to NOT starting. It’d take
several turns and only when I turned and held the
key would the engine turn over.
I had a new starter put in and no problem. Now I’ve
got a burning smell under the hood where she’s run
long. There seems to be visible oil on the engine on
the passenger side that burns. I’d like to dins the
leak and hand it fixed. Anyone know what the
possibilities are?