You should buy Motorcraft/Autolite plugs to avoid problems. You never mentioned mileage, if the wires are original replace them too. What brand did you buy? A turkey baster is your easiest and cheapest method to change the P/S fluid, you have to suck it out and replace it a couple times over the next months to get most of it, it use Mercon. A quick call to your local parts store will tell you how much that brake hose is, depending on condition of the steel lines you may end up having to replace them as well so be prepared for this. If you can change the oil, you can change the transmission fluid, the fill & drain plugs are clearly marked on the driver's side of the tramission, takes just shy of 3L of Mercon. You will need a suction gun or pump to refill the transmission.

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2010 Ranger XL 2.3L 5 Spd 3.73:1 Bone Stock
2013 Scion FR-S 2.0L/H-4, 6spd, 4.11:1 Fast Enough Stock