I usually start with the frog. Its easy to cover a lot of water in just a few minutes and get a feel for what the fish are doing. While throwing it, I'll look for bait and other surface activity, If i don't see much happening on the surface, I usually won't stick with the frog for long. From my experience, if the fish want the frog, you usually know within the first few minutes. At least that's how it goes for me, I'm not a patient frog fishermen, if I throw the frog for 10-15 minutes and don't get bit, I'm putting it down for something else.