Yeah you've already got a good order. Those are basically all of the main UC Timeline Gundam works, in order of release, and they do get continuity of characters and themes.
There are also side-stories that you can watch at any point now that you already know of the One Year War, such as 08th MS Team, 0080:War In The Pocket and 0083 Stardust Memories. In general, I'd go to the Gundam wiki and just follow their listing there.
Also a lot of people recommend watching Unicorn Gundam after Char's Counterattack, but it isn't necessary for Hathaway's Flash.