Adding amazon npc is no different from adding vanilla npc, you just change race and race abilities of amazon, tweak HP/MP/SP/Carry Weight or another ActorValue, then just drag&drop in world and add some AI behavior / day schedule / follower option / merchant option (for natural looking).
For better understand NPC mechanics in game, use Tes5Edit, most records on actors are self explanatory(if not, use creationkitwiki.com and search field)