Good evening y'all. I am a long time 40K fan and want to get into AoS. I have one Audible credit left, I plan on buying physical copies now instead. What is THE BEST AoS book to get into the hobby? I know a little bit about all of the factions. I plan on owning Deepkin and Sylvaneth armies but I genuinely think that all of the factions and sub factions are cool. I legitimately can't think of anything about AoS that does not look cool. With that being said I don't know much about the lore. The world plains are a little confusing to me but don't let that hold back a recommendation. I already have access to Dominion because of the BL App. I do plan on buying a old rule book to get into the lore a bit more but that will have to wait. Thanks for your time and energy.
Edit: Thank you for the comments. I do have access Darkoath, The Return of Nagash, Dominion, and Realmslayer.