Loaded question...
1) What port are you planning on fishing out of? At least in general, Rochester and east or Oak Orchard and west? IMHO, the lake fishes almost entirely differently on the east end vs. the west end.
2) Buy a probe. Helps you dial in what speed they want on a particular day and more often than not, temp is crucial to finding salmon. Steelies, it seems on Lake O not as much (its imperative on Erie).
3) Read the fishing reports, read the fishing reports, read the fishing reports, read the fishing reports
4) Find the guys that fish a lot out of the port(s) you plan on fishing out of - network, network, network, network.
Summer salmon easier to find as a general rule, fall is unique unto itself - the temp thing can fly out the window. Spring and Summer Kings wouldn't be caught dead in 60 - 65 degree water unless there were acres of Alewife there, I regularly catch Fall Kings (which are getting ready to die anyway) in the early morning on J plugs flat lined over 50 to 150 fow when the surface temp can be in the low 70s.