If you are used to a spinning reel, go ahead and use one. You can get other reels later once you get started. Spinning reel means spinning rod. You are going to need a bigger rod, one rated for a maximum of at least 12 pound test (I would go for a 14-15 max rating in case you get a chum in the fall). The length isn't so important but for coho you need medium-fast action so 9 feet or more. Spool up your reel with line that's less then the max rating of your rod. Set your drag so the rod bends not quite all the way before the line starts to pull out. Too tight and your rod (or best case your line) breaks. I've seen it so many times... someone hooks a chinook and tightens the drag - snap. Setting float depth is an art. Just start short and gradually go deeper. You will get snags so bring extra hooks/weights/leaders/etc. Learn how to tie a bait loop for wool/roe. Get some bait and you are ready to go. When you get there watch what others are doing. Ask questions if they seem friendly. And please, don't copy the snaggers, there's already enough of that BS. If the fish doesn't bite you are not sport fishing. Remember, the only way to really learn is by doing it so get out there and be patient.
Oh, and don't bother with Capilano in the summer unless we get at least 30mm of rain because there's not enough water for fish passage.