Sausans Garrision is a intermediate grind-zone. Sausans mobs are primarily fought for quest-related reasons and also used as a grind spot early on. The xp here is decent nothing special. With that being said, this spot is decent early on, but you should focus on questing until you reach level 56 - once level 56, you can grind Polly's for better, more profitable rewards. If you reach level 56 but still cant kill pollys sausans will do until then.
Elric Shrine is located east of Velia; Velia is Black Desert's first major city when you start the game.