I'd change #4 with "do emissary quests". WQ gear isn't useful if you're not going to play that alt in the near future, but emissary cache can drop legendaries which are always useful.
At the moment I'm at 4x110 (one main, 3 alts). I only log them every 2/3 days for emissary quests and to complete the suramar questline whenever I can. Missions/AK is done via Legion App, that thing is an immense timesaver for altoholics
Your new alts are going to be starved in Order Resources. The most efficient way is to just buy some OR caches with Blood of Sargeras on your main and mail them to your newly leveled alts until you can afford the 4th order hall trait (100 resources per WQ) or until you get a bodyguard with Elixir of Plenty
After you have the 4th class hall trait you can go on other WQ. My priority is relic > AP > other gear (I have no problem dumping half a million gold in obliterum if I'm planning on gearing that alt, hence AP over gear).