buying 2006 legacy wagon 3.0 need advice about leaks

[InfinX]

I'm buying a buying 2006 legacy wagon 3.0 I don't know to much about them and had a inspection done on it came back as a very tidy car just has a few problems. the diff mountings are covered in oil and split one of the control arms is weeping oil and just worn out. it is leaking oil from the sump gasket. And there is a leak at the bottom of the engine by kind of where the bell housing is but they couldn't see exactly where it was from as they would have to take a lot of stuff off to get to the leak, is there any common leaks that it could be? how much would this all cost how hard is it to fix these problem and how urgent are they to fix?