Another Beginner

I use a 7.5' 5x tapered leader for pretty much everything unless I think I'm going to be doing lots of dry flies on a trip, then I'll put a 9ft leader on. I would change the fly line by virtue of the fact that it is so old, but you may also want to attempt to get some cleaning solution and just scrub it up as well. It lasts practically forever if it is not stored in the sun, and with cleaning it may work fine. If you do get new line, I would look for some factory second line of some kind; it's usually cheaper and just as good. I have used Cortland line from Walmart and like it, and on the outfit you have there I personally wouldn't dump out a small fortune on line. I would put the money into a better setup first. Line can run upwards of $75 a pack, but something in the $15 - $20 range is what I would put on that rod. I get all my leaders from Walmart too, the Cortland ones. I usually get three or four tapered leaders, and always keep a spool of 4x, 5x, and 6x tippet in my vest. If you want to fish streamers or big dries keep some bigger tippet sizes as well, it helps with fly turnover. I am hoping someone else who actually knows what they are talking about joins in here soon lol. This is mostly just stuff that works for me, and I think you have a good starting point there. If you are going to use nymphs, I would look into starting with some small strike indicators to help. They do more than show strikes. They also help you keep the fly in the feeding lane and show you how it is drifting, allowing you to get to the fish and present the fly naturally. I'm not sure what else really. The important part from here is getting some time on the water!