An impact wrench makes forks easy to take apart.
Buy 2 quarts of fork oil, as both forks combined should take just over 1 quart to fill before you syphon off the tops.
5w is stock, or you can use 7w or 10w if you prefer the feel of thicker oil.
Good time to change springs if you're a heavy guy.
Oil and dust seals, and might as well replace the o-rings on the caps and the washers on the bottom bolts.
Make sure the inner upper tube and outer lower tube are not scarred or worn unevenly.