Apart from outfit, waders and boots. What else would you consider vital to a new fly fisherman.
e.g. types of flies, vest... so on and so forth.
You can't get everything at once. You need to pick the seasonal quarry and just target that to get you started. Coho are up later this month and thru October. If you're going to start there, pick up a decent 7 or 8wt with a multi tip line or a basic floater and have someone cut it back for you to allow different sink tips changes. If your reel comes with a spare spool then try find a clear intermediate sink line.
Flies, start with a few of each of weighted and no weight. I would start with black wooly buggers and some natural and olive muddler minnows, a few christmas trees and a few coho flies. Finish the Coho season like that. Once you start loosing flies to fish, trees, snags, poor casting whips losses and the occasional hooked neighbor or passer by, you will quickly realize that you will need to start tieing you own flies. My first weekend fishing started with Coho season and it was a killer year with limits of 4 every time out to the vedder that month. After the first weekend and about $70 in flies later, I bought a basic tieing kit and started that tieing my own that Monday.
You'll need some leader and tippet - don't need to get fancy. 6 or 8 # for Coho and 10+ for Spring and Chum.
Get a nail knot tool and practice a few knots to connect your tippet to the leader. Get a clipper or leader tag nipper with a eye cleaning needle. Don't need that but its handy. Pliers are needed to mash the barbs down and to remove solid or foul hooked fish.
Please wear eye protection and a hat, when learning to cast on the river your head and face will get in the way of a perfectly good cast at least once a day. Take some larger bandaids because your stripping finger is going to get cut thru the skin. You hands will get soft from the wet line and then the strip to set the hook will result in a deep cut in the crease of your finger joint.
Don't forget a knife and don't put your reel in the sand.
Bring a bag for your fish, a fishing license and a pen.
Ideally you can bring along an experienced and patient fly fisherperson with you to get you set up correctly and help you with fly and line selection, casting, mending (overall line management) and stripping.