You don't need the filter or the pan gasket. Jatco automatic transmissions (used in Nissans) use a screen inside rather than a serviceable filter. As they told me when I was taking the automatic trans course at the Nissan Northeast Regional Training center: "If you have enough debris in your transmission fluid to clog or restrict the screen, then you don't need a filter; you need a new transmission or a transmission overhaul."
There will be a 19MM drain plug on the bottom of the pan. Park park on a level surface after a short drive to warm up the trans fluid. Remove the drain plug and drain into a pan. Replace the crush washer (Nissan P/N 11026-01M02) and re-install the drain plug; torque to 25 ft/lbs. Remove the dipstick and install 4 quarts of ATF. Run engine and check level, topping off the level as needed. Typically, it's about 4.5 to 4.7 quarts, +/-.
For fluid, you can use NissanMatic Type "D" ATF, which is essentially Dexron II. You can also use most synthetic ATF's; just make sure they are recommended for Dexron/Dexron II applications. I use Valvoline Maxlife Full-synthetic ATF, which I can get for $18/gallon jug at Walmart. Castrol Transmax Multi-import ATF is another good choice. *Avoid using Dexron III/Mercon ATF as Nissan put out a service bulletin many years ago stating that it could cause valves to stick inside the valve body. It's okay for topping off the fluid, but not recommended for a full service.