Picture this... You get all your gear together for a nice little day of fishing a local spot you've heard and been told a lot about, but have never been to yourself. You get your rod, reel, waders, all your stuff ready.
You have a good idea what's going in the water. You've already made up in your mind what you should fish.
You open up your fly box... and it's empty. So you get together your favorite patterns.
How many of each do you bring? And how do you decide how many of each size to bring?