94 Camry Oil Leak

My car is leaking oil. When I drive, and turn on my heating, I can smell a little bit of burning oil (a little stronger smell when i'm going slower, or am slowing down.) I usually takes about 15mins for the smell to start, and doesn't happen all the time.

The oil leak is on the front right passenger side. I took the car to a local mechanic, and was told 1) replace cam seal and crank seal 2) replace rocker cover gasket and 3) replace oil pan gasket. Seems to me like that's a little excesive, and they don't know exactly what's wrong. Any idea on how I can find out what needs to be done? Any way I can do the repairs myself? Any quick fixes (ie. Oil sealant). I really don't drive the car too much, maybe 500km per month.

Thanks