First off, the size line you should use would depend on the size of the fish expected to catch. If the lake you are going to is known for large fish, go with the 20# braid. I've never known a pike to be line shy.
As for leader, forget the flourocarbon. Go with braided steel leaders in the 20-50# class. Pike can and will bite through flouro just as easily as mono.
As for lures, swim baits are productive, as are inline spinners. But don't forget the large safetypin spinners either. I've ccaught some of my best pike on my biggest bass spinnerbaits. Althouogh they will get torn up by the pikes teeth and bent out of shape by the fish thrashing around.
I've also had good luck on Rattle Traps, and Rapala Shad Raps. Large beetle spins with curly tailed grubs also produce well.
Another consideration is bait color. If the lake you are going to is crystal clear, then by all means, use natural colored baits. If there is any color to it, then use white or yellow. Yellow was my favorite color in the tannin stained lakes I fished back in WI.
Do not forget the steel jaw spreaders and a good pair of pliers to get the hooks out. Pike have bony mouths and they are full of razor sharp teeth. You do not want to get your hands near their maws unless you are looking for a trip the local drug store for boxes of bandages.