I have never used braided line but am going to give it a try. I have Sufix 832 40lb. Is a leader always used with braid and if so what should I use?
Couple things:
Don't tie it straight to the spool on your reel. Leave some old mono or fluoro on the reel and tie to that. Reel the braid over the top of it and I don't worry about a special knot for this. 50 yards is a long cast so 150 yards of 40# will fill three reels if you do it right.
Doug's recommendation of dropping down one power on your rod is also good for me too. I use a MH rod for most applications when I use braid. You just don't need a broomstick to get a good hookset with braid on a soft plastic bait. Most lakes I fish are pretty stained so I don't even use a leader for T-rigging. I tie braid straight to the hook. If you want to use a leader of fluoro or mono use an Alberto knot or try the Lefty Kreh knot to join the two together.
Another thing, make sure the hooks you use either have a welded shut eyelet or that the eyelet is closed very well or 40# braid can slip out of the tiny gap where the eye closes on the hook. Most hook makers now make hooks especially for braid or "Superline". Ask me how I know!