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dmarc85
I would do a #6 weight forward floating line if you are planning on dry flies and shallow nymphing. You can loop a leader onto the line, leaders can be bought at most any fishing store not just fly shops. I would go with a 9 ft 6x leader or heavier and then tie tippet tippet on to that with a double surgeons knot. Backing is pretty simple get 20lb. backing look on the reel specs to see how much you should put on. Or go to a fly shop and they do it all for you for free if you buy the line there. They will even do the backing etc.
You will soon want to learn to say fly rod. Anyway, welcome to the dark side. It starts out slowly and then you will want to start tying your own flies. Then... Stick with it and take a lesson or two. There is a bit larger learning curve but there are lots of people who have been there and are willing to help. A local fly shop is a great way to get info. also try Fly Anglers OnLine, Your Complete Internet Flyfishing Resource.
definitely say fly ROD Not sure what you meant about the dark side though. I thought it was the other way around.