Hi, an all Nurgle daemon army is totally viable in
AOS With the Maggotkin Battletome you are also free to add a range of Mortal units too who can help pack a punch in areas your daemons may be lacking.
To start with, in Matched play you must have at least 2 Battline units at 1000 points, so the list you have posted is a little short with just the 1.
Plaguebearers benefit from being in larger units as it makes tham harder to target with shooting and in combat.
I would reccomend starting with the Start Collecting or Blight War (or both!) here's a list i wrote, also with the intention of (most) units crossing over into
40k. The blightkings are the only
AoS exclusive unit in the list, but they're great models and pack one hell of a punch in game, plus they fill that all important second Battle Line slot.
Leaders
Poxbringer Herald of Nurgle (120)
Daemon Prince of Nurgle (160)
Battleline
30 x Plaguebearers (320)
5 x Putrid Blightkings (160)
- Nurgle Battleline
Units
3 x Plague Drones (200)
Total: 960 / 1000
Allies: 0 / 200
Wounds: 78